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      11-30-2012, 02:40 AM   #21
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Drives: Riviera Blue F10 M5(Mika)
Join Date: Apr 2012
Location: Sunny San Diego

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Originally Posted by star21 View Post

A friendly business competition will certainly help the customer in the long run. I think it'd be interesting to see the RPi exhaust on a DynoJet versus a Dyno Dynamics unit.

Since the RPi exhaust claims the most significant expected gain of 20-30 HP, I think it'd be great to independently verify it. The 3" piping and VERY straight through design (so much so that it includes a new support brace!) will definitely help to reach that goal. The straight through design also goes in a completely different direction from all other exhausts on the market.

The exhaust system you can tell is a tuner shop product as the weld joints appear to be done by a skilled hand. It looks well built and again shows contrast to the other big names on the market who probably have robotic welded joints, pressed muffler sections, etc. I'm not a fan of the muffler look/design and the support brace but if it works then one doesn't have much to complain about.
Actually I'm not a fan of the muffler design that much either. In fact I'm highly considering having RPi design me a one off Y-Pipe design for a complete muffler delete on the system. Coming from a Full RPi Stage 2 E60 M5, the straight piped exhaust system for the V10 produced a crazy insane amount of drone and no other drone in the world will ever be worse than that car was. Therefore doing a muffler delete in an turbo muffled F10 M5 wouldn't bother me at all. Just remember that I am a little crazy when it comes to the decibal level on M5's. LOL!

But yes everything you pointed out is very observant and accurate. A lot of what you said has exactly to do with the generation of so much power. That design came out of hundreds of hours of Research & Development and hundreds of dyno tests.

When you want your exhaust system to look pretty, you call Akropovic.

When you want proven power for your M5, you call RPi.
There's just no better looking sedan on the road than the BMW M5.