Between H, X, and just strait pipes, this is merely a performance question with no concernof sound, what makes one of these better than the other? I know the X flows better than the H, but wouldn't strait pipes flow better than both? Anybody know how this works?

 

straits would not flow better than the others. when the exhaust pulse of one cylinder on one bank passes through the x it causes a vacuum in the other banks pipe which actually sux the exhaust out of that bank. its called a scavenging effect.

 

Oh so that's the purpose of it. This effect doesn't not slow down the overall flow of one side or the other than? That's where I'm confused at.

 

no it speeds the flow up. its kind of like the LSA rating on cams. when you hear a cammed up all motor car alot of that lope is the LSA rating on the cam. LSA is the overlap of the valves. this is when both the valves are open at the end of the exhaust stroke beggining of the intake stroke. the exhaust gases rushing out actually can pull more intake air in.

 

well yea that makes sense

 

so are you saying the x- pipe will actually be better than the other two?

 

x pipes unarguably produce more numbers than the others. and before someone else comes on here and says they have a ricer sound, not once has my car sh#t out any unclebens noises.

 

good thing I made this post for "performance only, with no regaurds to sound". There are tons of post on here about sound and few about performance. I just never seen the question asked about strait pipes in conjunction with the other two before. BTW, mine has never had that sound either!

 

the reason nobody really cares about performance with a midpipe is because the difference between them are so meager. thats why it always comes down to sound

 

The X makes more then the H (like 1 or 2 hp) and straight pipes cause backpressure by not allowing the pulses to merge. When the pulses merge they flow togather and pick up speed which is what causes the vacum which is what causes the scavenging. When the pulses cant merge they slow and backup all other gasses in the pipe.