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      11-10-2011, 03:27 PM   #88
M3DCTBT
First Lieutenant
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Drives: E92 M3
Join Date: May 2011
Location: New England

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[QUOTE=M3DCTBT;10780263]
Quote:
Originally Posted by GTM_Challenge View Post
Quote:
Originally Posted by M3DCTBT View Post
The X pipes that make the best power merge at the beginning after primaries. RPi and Gintani. The stock style x's seem to make less when tested on our dyno in my experience.
The RPI acually has the merge after the normal spot. I think gintani is the only one that moves it forward. The downside of moving the X section around is it can effect the sound, usually for the worse we found according to customer feedback. Ive never seen any back to back dynos that have shown more power by moving the cross over forward, even in our own development
The newest rpi has the x closer to the front. Which gives the car a more exotic sound howl and a tiny bit of rasp on full throttle. Which sounds awesome to most. I also have never seen dyno charts of any x pipe development so i find it hard to believe any vendor tested these designs at all. I picked up 28whp same day same dyno with turner test pipea on the same tune. Stock rear crappy X and all. Alot of bs out there for an additional 1 to 2 whp.
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