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    • BMW Performance - Forums, Tuning, Racing, Parts, News, and Motorsports RSS Feed

      Published on 02-25-2014 09:20 PM
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      The war is officially in full swing. The first battles will be fought by tuned cars until the S63TU in the M5/M6 gets a reliable turbocharger upgrade option. Here we have exactly such a battle with an F10 M5 with an ETG tune, AMS catless downpipes, and a catback exhaust claiming 650 horsepower to the wheels versus a Renntech tuned E63 AMG with aftermarket filters claiming 624 horsepower to the wheels. ...

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