X pipe or H pipe, again

71Scamper said
Because Nascar engines are constantly running in the upper RPM range the x pipe makes more power for them.

My setup will benefit more from an H-pipe. I guess you could say the decision would be based off the engine build and purpose of the vehicle.

That was my point. Nascar wouldn't put them on there if it didn't improve power.

Like I said before, I would run an H pipe on the street. For better low end power and torque. X pipes are for 7k+ rpm race cars, in my opinion.