SHELBY GT 350 Member
Joined: Oct 2010
Location: Desert Southwest
Currently running neither. Factory X removed. Sounds a bit better (lower tone, barely any typical V6 rasp at all) but I have custom exits, so that effects the sound as well. Will be having an H pipe grafted in eventually, to see if it lowers the pitch a little more.
H pipe: a little lower, more "classic" sound, if you will
X pip: higher, more exotic sound
My best approximation, anyway. HP/TQ differences not worth a hill of beans, unless you are running catless. Even so, not sure it makes a whole lot of difference without headers.