What would be better for boost and why? Any real difference?
If retaining the stock cats, an X crossover doesn't sound nearly as raspy when compared to running an off-road mid-pipe setup. I run "Pypes" cut n clamp X pipe to the stock cat down pipes with Borla ATAK axle backs. Other than just a slightly higher exhaust tone over an H-pipe, I don't really notice very much rasp at all. However, if running a high-flow catted or off-road X setup without using mid-mounted resonators/mufflers? you'll more than likely encounter increased sound levels of rasp for sure lol.