Ok, this is probably a stupid question but here it is:
My stock exhaust setup looks extremely close the "H" and or the "X" pipe setup, what makes them so different and what are the advantages????
Looking under my car today while it was up on the rack for an oil change, I looked over my stock Mustang GT's exhaust setup and I didn't see much difference in stock -vs- H or X pipe setups. What is the big deal in changing it out???

Thanks,
Keith