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Old 09-30-2019, 09:09 PM   #28
M9G
2002 2.7 Boxster in green
 
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Join Date: Sep 2019
Location: Somerset UK
Posts: 102
There certainly are alot more contributing factors, I once took my ST mondeo to a rolling with a performance cone filter on and was down on power, rolling road guy told me to put original airbox back on with a decent filter which I actually still had in the boot of my car, I put it on and went back on the rolling road and performance went up. So yes a performance filter can have the opposite effect.

One key factor with the more air statement is "cold air"

I watch alot and I mean a lot of American mod programs and I cringe every time I see a beautifully modified car with a cone filter added into the engine bay sucking in lots of hot air
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