From what I've read, the H pipe isn't effective above something like 2500 or 3500 RPM's, so it's really only giving the same advantage as an X at low RPM's....which you shouldn't be at anyways right??

 

Yeah, if just look at the h-pipe you can see that the pressure tube is perpendicular to the pipes so if the exhaust is moving fast its obviously gona have a harder time crossing over, whereas the x-pipe forces the paths to cross. As my uncle says...H-pipes are old technology.

 

yeah it's kind of old tech but it is distinctively mustang in the sound. flowmasters and h pipes scream i'm a mustang...along with the smell of burnt rubber and squealing tires!!!

 

haha, yeah, well if the best sound is what ur after then go for H, if power is what ur after then go for X

 

my dad does a lot of custom headers and exhaust systems and we have yet to see anymore than 5-10hp with addition of an x-pipe on any type of vehicle so IMO it really does come down to preference of sound.

 

Either way H or X how much of a power increase would you get on a GT by elininating the stock catted pipe and installing an off-road pipe?