Split Dump Pipe Success Story

[rmahnovetsky]

I didnt say it didnt make any difference it made a diiference but not as much as everybody talk here....I had a full bell mouth dump pipe and 3.5inch system but i actually chucked it on the dyno today and found out its only a 4KW gain. This was done in a one of the best work shops in melbourne and everything was done properly.SO PROVED NOTHING WRONG WITH THE CAR OR THE EXHAUST SYSTEM.

My thoughts would be because you had a 3.5 inch dump pipe before is the reason why you didn't get as much gain as the 3" dump pipes. The 3 inch being a little more restrictive thus it would cause more turbulence when the gases colide. The 3.5 being bigger won't cause as much turbulence. If someone had a 4 of 5 inch dump probably won't notice a difference at all. It all about removing the turbulence behind the turbo. Anyone else can comment on this theory? seems ligical to me

[jazza08]

From what ive read yes your idea is 110% correct, its about keeping the exhaust gas's and wastegaste gas's away from each other for aslong as possible in the system to reduce the turbulence and increase the efficency, having a bigger dump would mean that the gases aren't fighting each other quiet as much as in a small one to rush down the same pipe in a similar direction