I believe that is the debaffling mod, not sure what kind of gains you get.
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removing this was probally the best thing i have ever done..
all 3 series have a baffle of some sort.
it sounds like a CAI the good thing is it only roarrrs at 3 1/2 rpm and higher.
it adds like 1-2hp i heard.
yeah, removing it makes the air box much less restrictive. Its not unheard of for that part to be rmeoved a small tube run down out the bottom of the box to pick up even more air. There's link I have at home detailing how to do it on a z3 airbox.
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I hate bringing up an old thread but I decided to do this to mine for the hell of it. Problem is, my airbox seems to be epoxied shut and I can't get the little bugger out. I guess I'll just crush it and take out the pieces
I believe that baffle is intended to reduce engine noise. I've got a '95 318ic and I removed it by pulling the whole box and replacing it with a heat shield from East Coast Induction Systems and a cone filter.
The engine revs a lot freer and the acceleration is a bit quicker, but the car is louder.
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