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Old 07-18-2010, 08:26 PM   #1
fredwlau
Registered User
 
Join Date: Jul 2010
Location: Pennsylvania
Posts: 22
My Ride: E90 335i
hpf stage 4 or s/c e9x

I know that the hpf stage 4 would be faster but by how much?

Thanks for any input
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