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Chevy Silverado/GMC Sierra - Owners hangout



  • txyank1txyank1 Posts: 1,010
    I've had a Flowmaster on every truck I've owned, but never with any expectations of HP or MPG increases. It's all about the sound. :D
  • noobie1noobie1 Posts: 326
    It's true about over oiling those things. I have the stock replacement in my truck. Recently registered a DTC, P0101-Mass Air Flow System. When I took it off I noticed what appeared to be soot coating the honeycomb and those other thingies just downstream. Soot? Didn't make sense. So I blasted it with some B-12 (frowned upon by the book) and put it back on noticing a little improvement. Later concluded the "soot" was a thin coating of oil from the K&N which had collected microscopic particles of dirt. That's the theory anyway. I intend to take it off again and do a more thorough job (before I spend 200 bucks on a new one).

  • rayt2rayt2 Posts: 1,208
    Ain't that the truth ! :P I always like to "hear" my truck, the stock exhaust just doesn't cut it. My wife still to this day can't get over my removing a perfectly good new exhaust system from a new truck to install a new Borla system, ahh woman what do they know about a motorheads thinking LOL !

    Ray T. :shades:
  • I have to disagree with some of the other replies to your message. I don't think I would modify a brand new truck while it was still under warranty, however I always have owned used trucks and I have always installed a K&N air intake kit. I swear by them. My current truck is a 1997 5.7L silverado. I installed a K&N FIPK. I can notice better performance particularly when I am towing. I also get better mileage on the highway by about 2 mpg.

    As far as the issue of over oiling goes, I have never had that problem. The filter comes to you oiled and ready to go. When you do clean and oil it (50K later) you can look up the exact amount of oil you will need on the K&N web site. The oil is pink, so its easy to see how much your spraying on a nice clean white filter.

    Also, you can save about 100 bucks if you buy your K&N kit on ebay.

    I love it!
  • txyank1txyank1 Posts: 1,010
    Hmmm, I've never seen a white one other than brand new unoiled. Even after cleaning it. Always pinkish.
  • I have a 97 5.7 (350) silverado. The OEM exhaust is completely dual, with two cats and two pipes until they combine in one huge muffler. the exhaust then comes out as one pipe and terminates behind my passenger side rear tire.

    I am considering cutting off the exhaust right in front of the muffler and installing glass packs, continuing the true dual exhaust and terminating with a bend behind each rear wheel. I love the sound of glass packs, but I don't want to you to hear me from two blocks away. I just want a nice low throaty sound with out the excessive noise.

    What do you guys think? My local shop ( I know the guy and he is really good) can do this for about 200 bucks, and it will be a lot fuller flowing then stock. What do you guys think?

  • rayt2rayt2 Posts: 1,208
    If you can afford it (and $200 does sound reasonable) go for it. The type of muffler you use will determine the noise. There are numerous choices to make for sound quality. While I have never used them Flowmaster has a wide variety of performance mufflers

    Ray T. :shades:
  • txyank1txyank1 Posts: 1,010
    I've never seen a "Glasspack" that couldn't be heard from 2 blocks away. You wouldn't be disappointed with a 50 series Flowmaster. I had it on several 5.7's and it sounds great.
  • I'm about to change my oil for the first time, and I don't want to drain the auto tranny fluid by accident as a couple folks here have done. Is the oil drain plug the one just inches behind where the oil filter is, because it looks like thats part of the tranny to me, but I'm mechanically challenged, so I don't know for sure.

    2005 Silverado 1500 5.3 liter, auto trans.
  • obyoneobyone Posts: 8,054
    yep it's near the oil filter.
  • stonegstoneg Posts: 47
    I've got just over 2300 miles on my 05 Sierra Duramax 6.6 L and have been very displeased with the "off the line" performance. 1st gear seams to really unresponisve. I am condisdering replacing the stock air box with a conical filter with a heat shield to allow more & cooler air in, replace the stock 3 inch exhaust with a 4 inch from the turbo back (to help reduce exhaust gas temp's and to help get the exhaust out), and adding the Edge Juice with Attitude chip/programmer.
    I plan on keeping this truck for about 8-10 years, and figure that if I can get 3-5 mpg more than now, it would pay for itself. I figure that cost to be about $1,500 installed. I am currently only getting about 12.5 mpg in the city, while a friend with an 03 duramax (with this same programmer, but w/o the intake or exhaust) is getting 16.5mpg. Very few of the sites selling the programmers will state ANY mpg gains, and the ones that do are VERY vague. I know that my 0-60 will increase.
    Will my mpg increase?
    Is this safe for my engine? (thats why I'm considering the exhaust)

    Also....a question for m_Boise...were you talking about the Tornado throttle body spacer? If so, did you add it, and did it make a difference in your mpg?

    Stone G
  • stonegstoneg Posts: 47
    I did finally find one and order it. It is made by DJ Motorsports. It was about $95 plus shipping. It supposedly doesnt have any visable mounting hardware, and resembles the Denali grill more than the other manufacturers. I should have it in a couple of days and will know then if it was worth it.
  • stonegstoneg Posts: 47
    Ive had my D-Max for over a month with around 2500 miles on it and dont tow anything either. However since I got it, I've had to pull a fairly heavy boat and another time a doulbe axle trailor with a large tractor/front end loader/bush hog on it. PLENTY OF POWER - LOVE IT. I plan on keeping mine for many years so I opted for the D-Max over the gas burner.
    Here is a list of what I have dont to it so far:
    Leveling Kit (raised front up 2.5 inches to level it out)
    Chrome Westin Nerf Bars
    Vent Visors/Hood Bug Deflector/Sunroof Wind Deflector
    BF Goodrich 185/75/16 All Terrain TA ko Tires
    (trimmed front valence just a little to keep tires from rubbing)
    Line-x Spray in Bedliner
    Tint Windows

    Future projects:
    Installing a "Denali" style grill
    Cam-Locker Low Profile Deep Tool Box with Rails
    Back Up Sensors (like the Fords have)
    Larger Air Intake with Heat Shield
    4" turbo back exhaust
    Edge Juice with Attitude Programmer
    and maybe a brush guard/push bar

    Damn all this keeping up with the Jones' (aka my neighbor and his F250)!!!
  • I have a 96 Suburban with a 5.7. i have true duals with 18 inch glass packs and they are really low and throaty, but when you really want to gun it they get really loud, i recomed getting 18".
  • Has anyone looked at the different types of packages GMS is offering on it's 06' Sierra? Such as one ($3K+) which INCLUDES 20" tires. There's also, on the extended model, a SHORTER box option. I believe it's 7" shorter to be exact.
  • m_boisem_boise Posts: 12
    Stone G-

    I bought the Poweraid TBS from Airaid. I have yet to install it. Been doing a lot of research, and am still up in the air about it--but I'm leaning towards selling it as the technology doesn't seem to benefit the Vortec engine that is in my truck which uses sequential port fuel injection. The same could be said most engines built in the 90's and later. I have an 05 Silverado Crew Cab, 5.3L V8 Z71 with 2700 miles. I have added a cat-back dual exhaust from flowmaster and the sound is great as well as going from 17.5 to 18.8 mpg overall with 60/40 highway/city driving. I just installed a K&N Air Charger intake system. No results on mileage yet. But it seems to have quieted the Flowmaster just slightly, I've noticed that when I step on it--the V8 really pushes through the higher rpms faster (above 2700) and the transmission seems to allow the rpms to go higher before shifting. While installing the air charger I noticed the stock system was really engineered quite well. The stock intake box was mounted in a way that it was drawing air from outside the engine compartment through a couple of rather large holes that opened into a space above the front passenger wheel well. The stock intake tube was just as large, if not larger that the K&N. It had a strange "reservoir" that dropped below the direct air flow and definately would increase total volume...but seems like it would slow the air down and cause some increase in heat--but I'm no engineer or mechanic. So my results on the K&N are still out and the TBS will most likely gather dust unless I get somebody to buy it from me. My next possible purchase would be a programmer...but maybe I should just enjoy the new truck and stop throwing money at upgrades and accessories.
  • z71billz71bill Posts: 2,000
    I know - many people really think that they get better performance & HP from the K&N filter - could it be that replacing an old "dirty" filter (used truck) - with a new filter could have given you the same result?

    If it really increases 2 MPG why doesn't the manufacturer just put it on at the factory? - GM, Ford, Toyota, Nissan & Dodge would KILL to get a 2 MPG bump in their full size trucks.

    First - I have has several VERY loud cars in my life - so I do understand -

    But if you really think about it - it's like putting baseball cards in the spokes of your bike - sounds real cool - but does it make you go any faster?

    If I only new that the 1951Bowman Mickey Mantel rookie card in my spokes would someday be worth $800.
  • m_boisem_boise Posts: 12
    I don't think I'm getting better day to day performance at all from the K&N Intake system--only very small changes at wide open throttle...which is not how I want to drive. The jury is still out on mpg though. I've heard so many conflicting reports on these things that I figured I would spend the $250 and get a real answer for my truck in my driving situations. I have no problem taking the stupid thing off if I see no gains and a dirty throttle body.

    As for the exhaust--it sounds more like a "truck" now, and the sound was 90% of the reason I added the fart can. The change in mileage that I saw with the aftermarket exhaust was real...maybe it was from the environment, gas quality, or the fact that I added it before reaching 2000 miles--maybe the engine wasn't really broken in and performing. Who knows? Sounds better and the dual look (no real function) gives it some uniqueness.

    Manufacturers adding mpg boosters? They are all in cahoots with oil companies anyway---otherwise we would be driving around for free using our own garbage for fuel by now ;) These vehicles are built to be non-offensive and meet government regulations while still costing too much and sucking enough gas to keep the fat cats fat.

    Anyway--enough rambing...just want to make it clear that I'm not here to promote any kind of product or aftermarket stuff, just wanted to hear from others' experiences and let others know of mine.
  • txyank1txyank1 Posts: 1,010
    I noticed that. It's the Crew Cab bed. Haven't checked to see if they shortened the wheelbase any. If not, what's the point? The model with 20" wheels sounds like a model Chevy had last year.
    I just looked and the wheelbase is that same looooong freakin' 143.5". But the truck is almost 10" shorter. Whoopty do. The thing I hated about mine was trying manuever with that wheelbase. And that's one thing I love about my Av. 130" wheelbase!
  • jerrywimerjerrywimer Posts: 588
    They had to have shortened the wheelbase.

    So in the 1/2 ton lineup you can now get:
    standard cab, short box
    standard cab, long box
    extended cab, super short box (from crew cab)
    extended cab, short box
    extended cab, long box
    crew cab, super short box

    I think the idea behind the addition is that some people want something with more space than you get in a regular cab, but don't need as much space as the crew cab. They also want a usable bed, but don't really need anything too large (sort of the average homeowner that just wants to be able to tote the mulch home without dirtying up the car trunk). This combination improves over the other options by meeting both requirements with the shortest possible wheelbase / turning circle in the lineup. It will provide the extra convenience of the extended cab truck without the "boat"-like manners in tighter spaces and should still give most of the other benefits of a 1/2 ton over the compact / mid-size trucks. Things like overall payload weight and towing capacity.
  • I think it's a good idea. Ford started, this but do NOT sell many extended trucks with the super short box. I wonder if these 20" tires and several box size options are a peek at "things to come" with the new the 900 GMT line, out next year?
  • txyank1txyank1 Posts: 1,010
    According to the Spec's right here on Edmunds ALL the X cabs (6.5' and 5.8' bed) AND Crew Cabs (5.8' bed) are still 143.5" wheelbase. No improvement there.
  • jerrywimerjerrywimer Posts: 588
    Edmunds has been known to have incorrect specs before. Given that the crew cab truck has the same wheelbase as the extended cab short box right now, there are 10" being cut out of the ec ssb truck. There's nowhere to put the extra 10" (it's in the cab of the cc, the bed of the [current] ec). Unless the rear wheelwell in the bed is going to be practically on top of the bumper, that is..

    edit: clarified a sentence (I hope)

    PS- I seriously doubt GM is going to go to the trouble of yet another completely unique bed. To keep the wheelbase the same as the current trucks, the frame rails would be cut down and the bed itself would end up with the wheel openings located that extra 10" further back as I mention above. Keeping the bed the same allows them to use the exact same bed that goes on the crew, combined with the same cab that all usual EC trucks have, on a shorter frame. Wheel opening on either part would stay the same, but the wheelbase would shrink ~10". Probably going to check out the Chevy sight to see what it shows..
  • jerrywimerjerrywimer Posts: 588
    Edmunds is definitely wrong. Check out Chevy's web site for the specs (dimensions):

    Extended Cab Short Box / Extended Cab Regular Box / Extended Cab Long Box
    134.0 / 143.5 / 157.5

    Extended Cab Short Box / Extended Cab Regular Box / Extended Cab Long Box
    220.2 / 230.2 / 249.0

    So, basically the wheelbase shrunk 9.5" and the length shrunk exactly 10". :)
  • jerrywimerjerrywimer Posts: 588
    Oh, and our "short box" is now being referred to as the "Standard Box".
  • jerrywimerjerrywimer Posts: 588
    Just checked the GMC site. Unfortunately it hasn't yet been updated to show anything about the EC w/short box yet. I assume GMC is getting this combo too? Maybe it's only Chevrolet.
  • txyank1txyank1 Posts: 1,010
    That certainly makes more sense. thanks. Edmunds wrong? :surprise:
  • dryodtdryodt Posts: 2
    Hey All,
    I am into my second month of my 2005 GMC ownership experience after 27 years of Toyotas we'll just have to see. Thus far the new truck Crew cab SLT 4x4 Z71 Package has been very satisfying. Took it from Oak Ridge TN to Tupelo MS and it averaged 19.9 MPG with only 1900 miles at origin. It has the 3.42 gears in the rear so that probably explains it. No sonner had I bought it than I aquired a 30" Award tarvel trailer. According to the specs and solid load estimation I am well with in the limits for towing despite the higher ratio in the rear. I got 12.3 towing from Oak Ridge to Atlanta and back a little less. Anyone know about towing in OD with the towing selector on. Manual says go for it but history says 3rd gear only may be the way to go. I think the computer may know better? :)
  • KCRamKCRam Mt. Arlington NJPosts: 3,516
    When you do find errors like that, click the Help link in the top right and file the correction. We hosts do it too!

    kcram - Pickups Host
  • stonegstoneg Posts: 47
    I have been speaking to a couple of aftermarket specialty shops around here, and they all have been telling me to wait until my d-max has at least 10k miles on it before I add the programmer. I am however definatly replacing the 3" exhaust with the 4", as everyone says my mpg's will go up. Now, with the air getting out faster, wouldn't increasing the air in, result in better mpg, more horse power, or ???
    Since my truck only has 2,500 miles on it, it looks like I should take the programmer money and spend it on 16"x 10" wheels and replace the stock 16" x 6.5" pizza cutters.
This discussion has been closed.