I have found that with an X-pipe the location w.r.t to the valve can affect the bottom end torque significantly on an engine with full exhaust and rear tailpipes (i.e. a long system) which is important for a true street engine. I think the X-pipe acts like a half baked termination box depending on the area change and volume of the x-pipe. On a system will small pipe sizes it would make sense there is a potential improvement from reduction in back pressure due to the larger effective area to flow into but it would need to be fairly small sizing (or extremely long) to reap a large benefit
In engmod4T i think i found the order from best to worst
end of pipe (terminated at location of X,Y,H)
Y-pipe
X-pipe
H-pipe
the end of pipe was best but it was shorter which would lead to a PWTB being best perhasp.
The X, Y and H were all vert close to being the same
X pipes???
Moderator: Team
Re: X pipes???
Do you want the X-pipe designed so that the exhaust volume is split 50/50 at the merge?
Ed