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Old 01-28-2013, 12:46 PM   #5
Mango
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Join Date: Mar 2006
Location: Southern California
Posts: 23,408
My Ride: M54B30
and +1 what gheybe said. these cars are already precisely tuned from the factory and need nothing but maintenance. the airbox is 98% capable. the other 2% will get you 1 hp if lucky but just add a ton of noise. That's IF you find that lucky airbox. most take away power as said.
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