In N/A applications, I know the difference is minimal between the two types of exhaust crossover pipes. But I've heard that in forced induction you want all the exhaust scavenging that you can get. Now I'm using chambered mufflers and would prefer an H-pipe for the sound, and also an H-pipe would be much easier to fit on my particular car. Are the differences in power between an X-pipe and an H-pipe going to be any different than in an N/A application?

 

I have longtubes and an x-pipe. They fit rather nicely under the car...

http://www.lt1.org/car/xpipe/xpipe-front.jpg

 

My Spohn torque arm's crossmember makes an X-pipe setup much more difficult. Also, I tend to like the sound of H's over X's when used with chamber-style mufflers. I'm just wondering if the difference between the two styles is any greater because of the forced induction.