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RPI Exhaust HP Gains.

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Old Apr 4, 2009 | 12:51 PM
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From: Originally from Koeln, Deutschland. Enjoying it in Bonita Springs, Florida Now :)
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So I read the RPI exhaust for the 545i gives you 13hp. Is this at the crank or at the wheels?
Also, what kind of gains can I expect with a RPI Scoop/Exhaust Combo? I read that it should amount to about 15hp.

Thank you

-Krozi
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Old Apr 4, 2009 | 12:58 PM
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to the wheels, not the crank

RPI uses a dyno dynamic IIRC...so that's why the numbers are a bit lower (slight loss of hp's from crank to wheel)...where ever you dyno, make sure you stay with that dyno for pre and post dyno's....
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Old Apr 4, 2009 | 01:04 PM
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From: Originally from Koeln, Deutschland. Enjoying it in Bonita Springs, Florida Now :)
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Originally Posted by GENEaTALS' post='836377' date='Apr 4 2009, 04:58 PM
to the wheels, not the crank

RPI uses a dyno dynamic IIRC...so that's why the numbers are a bit lower (slight loss of hp's from crank to wheel)...where ever you dyno, make sure you stay with that dyno for pre and post dyno's....
So it's like 18ish crank hp?
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