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      10-10-2008, 10:37 PM   #7
GP20
Major
Canada
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Drives: Z4M, F80 M3, 991.2 GTS
Join Date: Jan 2007
Location: Canada

iTrader: (5)

You're hurting the performance big time. The Z4 comes stock with cold air intake. You've just retrofitted hot air intake on your car.

And google or do a search on "ram air intake" and learn how it works.
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