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General Intake / Exhaust Mods



  • 300michael300michael Posts: 1,815
    Read the fine print. 0% to .... increase. Get a tin can, and make one,and try it, it is far cheaper, and will do just as good, and it will save you $70.
  • Nowhere do I see statements of evidence about the effectiveness of these "performance" filters. Do they have the same filtering ability - in microns - of the disposable paper elements. If they don't, it's not worth the added wear on the engine for a small increase in power. How about putting two standard filters in parallel to feed the plenum?
  • namfflownamfflow Posts: 202
    Actually, that is an old racers trick. Back when there was space under the hood we would take 2 air filter elements and put a bead of RTV between them and stack them. This doubled the filtering and thus lowered the restriction.

    As to the filtering capabilities of K&Ns, the oil bath type filter they use removes more dirt from the intake air than a standard paper element. There have been studies but I don't recall who did them. It was NOT the mfg.
  • snaphooksnaphook Posts: 130
    I just installed a K&N in my 94' 325. There is no noticeable difference in power but I really wasn't expecting there to be. It does appear that my mileage may have improved slightly. Its a little too soon to be sure. Would I do it again? Yes. I like the idea that this is the last air filter I will have to purchase for this car. In addition, I too have read that this type of filter does a superior job at keeping the air clean. As far as it sounding different. Maybe a slight almost whistling sound during acceleration. IMO, this is a non factor.
  • tronsr1tronsr1 Posts: 149
    I guess it's the old saying "If it's too good to be true, it is too good to be true." I will save my money.
    Thanks again,
  • armtdmarmtdm Posts: 2,057
    Unless you are going to invest in a new exhaust ssystem, say a Borla, to increase HP youwill be wasting time by having more air sucked intot eh system, it has no where to go. Plus, after a few years the foam filters tend to fall apart from the heat. My oil analysis says they filter no better then paper elements which do not have the hassle of washing and "re-oiling" .
  • kyleknickskyleknicks Posts: 433
    I went to advance auto parts yesterday and found that the purator (spelling) cost $10 while the K&N cost $50. In doing the math, if i have to change the paper filter every 10k miles, i might as well buy the K&N plus the recharge kit for another $10 and not have to worry about changing my filter every 10k miles. if i'm not mistaken, with the k&n, it doesn't need to be cleaned out till 50k miles which i like alot! forget the claims for HP gains, if it could gain me a slight increase in gas mileage, i'll be one happy camper!
  • dgsgdgsg Posts: 29
    I have been using K&N Filters since the first became available for motorcycles. ( Sometime in the late 60's or early 70's? Damn, I am getting old!Used them in desert racing;District 39) They are some of the best money I have spent on my vehicles. On some vehicles you do see a slight increase in MPH and in all vehicles you never buy another filter! I clean mine every 30,000 miles. My last car had 192,000 miles when it was sold and the filter was still in excellant condition and the area past the filter in the intake tract was perfectly clean.
  • lwittorflwittorf Posts: 96
    I would like a response to this. I have a 01 ado with the 5.3 auto 4/4 and have been getting 18-21 mpg I put in a K&N and my mileage has gone down to high 15 to low 17s has any one else had this happen to them? I am going to call K&N and try to get some insight and also put the original back in and see if it goes back up. Thanks
  • fgf001fgf001 Posts: 98
    The K&N Fuel Injection Performance Kit for 1993-1997 MX-6 2.5 V-6 fits the same year(s) 626 2.5 V-6 perfectly, although you'll not find it listed anywhere. I installed it on my '96 626 and feel it was worth the bucks. Throttle response is improved across the board and makes sweet intake noise at full throttle, with more oomph than before. Mileage improved by 1/2 MPG AFTER I got through standing on the go pedal and drove normally.
  • fubarufubaru Posts: 5
    I put in the K&N in my single turbo H4 5spd not long after breaking in the car. Can't really feel any difference in acceleration, but I rarely launch her and only sometimes exit corners at above 4K rpm. Engine seems to growl a little louder under light throttle though.

    There was a post on i-club about somebody doing a dyno comparison on the '02 WRX with & without the K&N drop-in and showed +5 HP gain (about 227HP bone stock). The K&N plus fatter cat back exhaust (BPM I think) added +10HP.

    Before installing my K&N I ended up buying two different part numbers because the recommended one didn't fit well and tended to slip down into the airbox even with the rubber strips. Make sure your air filter, whatever brand, fits you airbox tightly or you are going to really screw her up!
  • armtdmarmtdm Posts: 2,057
    You are comparing a $50 K&N lifetime filter to a paper but you are replacing the paper every 10,000 miles. Manufacturer schedule is every 30,000 miles. Need to redo the math. Plus the cleaning and re-oling is a pain, oil accumulates in bottom of housing etc. Increased HP probably due to perception, feel good about the purchase.
  • dgsgdgsg Posts: 29
    Somebody is using WAY TOO MUCH oil!!!
  • glennyjaglennyja Posts: 8
    lwittorf ,

    I had almost the exact same experience as you. I drive a 1999 Suburban, with 5.7L and 2WD. Last month I installed a K&N air filter.
    While the vehicle has increased power, the mpg declined from 20MPG to 15.9mpg. When you get a response from K&N, please share it on this site. I look forward to your response.
  • lwittorflwittorf Posts: 96
    I will be sure to post when I get hold of them I was not able to up til now but mon I will try been just to busy. Their # is 909-6849762 for their enginering dept or at least that is what the operator gave me and didn't have any thing for manufacturing so that is what I am going to try. Catch you later.
  • lwittorflwittorf Posts: 96
    Well I talked to K&N today and they told me that when you put a filter like that in it gives a lot more air so you have to disconnect your batt for about a hour reconnect so it can reset the computer then it will work all right. I will try it after I empty this tank of gas but it dosen't seem right to me as the oxy sensor should pick up the extra air and adjust the settings to where they should be. Will run 2-3 tanks of gas and will repost what I come up with.
  • I was wondering if K&N Will work on a 96 Subaru Impreza. Also I was wanting to know about a K&N Supercharger for my car. Any info is greatly appreciated. Thanks
  • kyleknickskyleknicks Posts: 433
    what are some of the websites that i could purchase a k&n airfilter for my 2k maxima besides

  • fangio2fangio2 Posts: 214
    generated by the installation of a K&N air filter require any other modifications?Would larger performance tires and wheels be a good idea?Also perhaps beefier struts?T he car is a 2001 base RIO.
  • dgsgdgsg Posts: 29
    Try for K&N air filters.
  • kyleknickskyleknicks Posts: 433
    u're saying 30k miles for every air filter change? do you actually do that? granted, my manual does say every 30k miles, but it sure looks like it needs to be changed now that it's at 10K.... i figure i would change it every 10 to 15k miles
  • armtdmarmtdm Posts: 2,057
    I change mine once a year whether it needs it or not. For less then $10 and minimal time to do it I just do it and for me that comes to 12,000-15,000 miles
  • jpstaxjpstax Posts: 250
    I installed K&N air filters on both our cars last Saturday (wife's '00 Buick Regal GSE, and my '98 Lumina LTZ). Her car seems to have gained more power. The maximum SC boost was 7 psi, but now it's up to 8 psi. My car also seems faster. I also installed a Tornado unit (don't laugh), and the car lays rubber with only 1/3 pedal (was 2/3 pedal before). It could be psychological too. I might be imagining power gains that aren't there.
  • I put a K&N air filter into a '01 BMW 325 and started getting that "rear-pressed-against-the-seat" sensation when I accelerate from a standstill. It's been there for 2000 miles and so far no problems. I noticed that the stock air filter has a giant piece of foam glued to the dirty side. That seems very restrictive and I've never seen a design like that before.
  • I installed a K&N air filter in my 1999 Grand Am GT. I'm not sure if the results are anything to write home about. It does seem that the car at cruising speed pulls slightly less RPM's, but I'm not sure if that's possible (based on gearing). It seems to also be a little smoother during acceleration - like the engine is working less.

    I'm concerned about a previous post regarding K&N's direction to disconnect the battery to reset the computer. No where in the instructions does it mention disconnecting the battery. Shouldn't the electronic sensors automatically adjust for the air flow? When a stock air filter becomes dirty over time, doesn't the sensors adjust for the restricted air flow? Something sounds fishy with the posts regarding reduced gas mileage. My mpg have gone up slightly, but probably only because I replaced a very dirty air filter!
  • bryancosbryancos Posts: 282
    Yes, over time the car's computer would *eventually* readjust on it's own -- but by disconnecting the vehicle's battery to reset the computer, you are essentially forcing it to reprogram itself IMMEDIATELY to the current engine conditions, so you'll see the effect now, rather than having to wait for it.

    When I put a K&N air filter and a cat-back exhaust on my 99 Jeep Grand Cherokee, the tech suggested doing the same thing --disconnect the battery so that the onboard computer would re-adjust for the increased air intake and reduced backpressure... It made sense, so I did it -- and saw my MPG on the trip computer jump by 3-4 miles per gallon after my first tank of gas.
  • What are the other implications of disconnecting your battery terminal? Besides losing your preset radio stations.
  • bryancosbryancos Posts: 282 might have to reset your clock, reprogram your power seat and power mirror memory positions, etc. It'd be similar to what you would do if you had to replace your battery... but you're certainly not going to harm anything in the vehicle by disconnecting the neg. battery terminal for a few mins. If anything, it's an inconvenience... nothing more.
  • obyoneobyone Posts: 8,054
    We use to run the tornado units in some of our company vans for the reported increase in mpg. Sad to report that it is nothing more than a piece of metal that does nothing. I also read the testing that was done in a mechanic's trade journal and they pretty much verified our findings. What do you expect? They were designed and made in Korea.
  • The supercharged 3.8L in our '90 SuperCoupe Thunderbird felt stronger with a K & N. Easy and low tech...leaves more time for driving.
This discussion has been closed.