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'13 Jaguar XF, '11 BMW 535xi, '02 Lexus RX300
Since it is smooth, I am wondering if I would gain much from replacing the air tubes like you did.
You are apparently still using the original air box and filter. I plan to modify an air box, or at least its cover, to attach a cone-inside-a-cone air filter:
Currently the 5" filter is on a 3 week backorder. K&N has something similar:
This is the only place that seems to have these, but according to them, these particular filters are all foam mesh; I want cotton:
K&N has an open top filter that they admit to on their web site, but it's not an inner cone style:
Anyway, I've found that the large (female) end of a 4-segment metal 90 degree vent pipe will just fit into the airbox tube. If I use only the last or last two segments (slid in from the inside after trimming a few ribs in the cover), I have something to clamp something else to, but it probably couldn't be directly to a cone filter because the angle is sure to be off.
For the intermediate piece I bought a flexible 3" dia. aluminum heater vent (-100 to 450 degree F). Assuming it can withstand the pressure left over after the cone filter gives air to the engine, it should do the job just fine. I might use a piece of metal to act as a support at the top that is clamped down on either end of the flexible vent.
When done, the cone end should be pointing right at the existing air hole.
All I need now is to find a sealant that can withstand the temperatures inside the airbox to seal off everything. Any suggestions? Does anyone know how hot it can get inside there?
I want to use the air box for cool air, of course. Unfortunately it doesn't appear that I can route a secondary tube to get more outside air, unless I cut another hole in the inner fender next to the existing hole, or cut a hole in my hood.
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