X-Pipes...

I understand the function of an X-Pipe...

But is there a science in regards to how the 2 pipes are merged...?

For instance: I had my exhaust guy weld up an x-pipe for me. I could tell from the placement of the pipes that it wasn't exact... or even close.

When my engine is complete and installed I want to get a new exhaust system to support it better. I plan on my 1-5/8" headers, 3" collector, 3" x-pipe, 2-1/2" tails, and some super turbos. Should I get my muffler guy to weld up another x-pipe for my new configuration, or should I get the hedman hedders x-pipe (it looks really clean and even... page 66 of the new summit racing catalog)?

I would think that there would be a restriction if the x doesn't line up. I've heard good things about the Dr. Gas X pipe but never have used or seen one.


Here's a link with some interesting reading.

http://www.pontiacstreetperformance.com/psp/exhaust.html

If you're going to go with a 3" collector, I would use a set of 1-3/4" primary tubes. A 3" collector on a set of 1-5/8" primaries has some serious deficiencies in scavenging.