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      11-10-2011, 05:23 PM   #87
First Lieutenant

Drives: E92 M3
Join Date: May 2011
Location: New England

iTrader: (2)

Originally Posted by GTM_Challenge View Post
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.