[hotrodmach1]

i just ordered the magnaflow cat back system from completeexhaust.com for 299 +ups, and the MRT h pipe with cats for 449.
I'm not a mechanic or an engineer, but from my understanding the h or x pipe equalizes the exhaust between both pipes, cutting down on exhaust backpressure, and thus improving hp and torque. The x pipe gives you more of an exotic sound, think european sports car, the h pipe is supposed to give you a deeper muscle car sound. I've heard this setup in nashville at the 40th and i liked it. i think its mainly personal preference, if you search the sites, they have sound clips of the various systems. I made my decision based on price and that they are stainless