How many guys are running true duals on their LS engine? I had always heard that these engines lose HP from true duals. Is that true? The reason I ask is I have a Tahoe and when I perform my swap, I'll have to redo the exhaust.
Well because I have a 2dr I can run a single pipe down each side behind the long tubes. I will be using high flow cats and magnaflows.

Will it rob horsepower? Would it be better to do a y-pipe, or just do the above and connect an H or X pipe? Or just run without an H/X pipe
The engine will have a mild cam and mild headwork, with the normal bolt ons.