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  1. #1
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    RPI (Race Precision) Claiming 45 wheel horsepower F10 M5 gains with prototype exhaust

    So is the exhaust a big bottleneck on this car? RPI is claiming some huge gains with a prototype exhaust although no pictures or graphs were posted.

    Click here to enlarge Originally Posted by Eloy@RPI
    Our assumptions were correct about the exhaust and we were able to get some insane gains with the prototype exhaust (up to 45whp). AJ and I are now working on improving power throughout the entire band with a new tune. The new tune will take our DP, Exhaust and intake to a whole new level. Stay tuned!

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
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    Does it include downpipes? S63tu has BIG cats in the downpipe and you can unleash some power by removing it. But is it worth 45hp? I highly doubt that. The stock exhaust must be so $#@!ty.
    Click here to enlarge

  3. #3
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    Click here to enlarge Originally Posted by Sorena Click here to enlarge
    Does it include downpipes? S63tu has BIG cats in the downpipe and you can unleash some power by removing it. But is it worth 45hp? I highly doubt that. The stock exhaust must be so $#@!ty.
    Click here to enlarge
    I think it definitely would include the downpipes for these kinds of gains.

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
    : http://www.boostaddict.com/showthrea...r-kit-for-sale

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