Originally Posted by M3DCTBT
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