Old Apr 15, 2005 | 05:02 AM
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lilgrasshopper
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Joined: Mar 2005
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Default how much increase in mpg do u get with header and intake?

I'm just curious if it's worth doing. I have an m3 running around 20mpg stock, but after I added intake and full exhaust..it went up to 25mpg..which was great. Any idea?
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