"H" or "X" Pipe advice Please

I have been down this road so many times. This is a qestion that can be answered by yourself if you have any common sence. You have two masses that are being force through two pipes. What happens if you force them to cross paths?? Wouldn't it be better to let them flow in their straight line. The H does not interfere with flow it only equalizes back pressure.


Hot rod TV had a segment on the new GT 500 after market Exhaust. They found the H pipe was alot better on some engines. X pipes scavenge cyinders, This will create a neg pressure in the next cylinder to be fired on that bank. Thats a good thing, The problem is mopar and GM fire orders are not even fires, 1 , 8 4 , 3 , 6 , 5 7 , 2 . How can the x pipe work on this firing order. They seam to work at a mid range only on some fords. But not at low or high RPM's

Placement of the H is after the burn. When you buy race headers you are given instructions to put on 18 inches of painted pipe on each side . After making a pass you are instructed to leave at least back to the end of the burned off paint . To short of a collector robs torque. Your H should be placed after this length . To be sure if you don't want to do this proceedure. Keep the H at least 18 inches past the colector flange no closer.

My car and everything I installed including the exhaust was built for H.P. on the street not for nice or a conversation piece. Having a shop with my own equipment to make what ever I want I tried them all. My exhaust is 2 inch tubes going to 3 1/2 collector and a 3 1/2 Inch exhaust. My H is a 2 1/2 pipe connecting them after the burn. Only for equal pressure. I do have a full exhaust but the 3 1/2 pipes dump in front of the rear. I added a open flange to the turndowns. I then conected the tailpipes and tips so there is some exhaust coming out the back. When you stand behind the car it sounds like it is all coming throough the tailpipes. 428 SB .

On one of my other dusters I am restoring now . I am going to put factory 70 manifolds with 2 1/2 pipes going to 2 1/4 tail pipes and tips . I will be adding an H , As all Track pack B-bodies came with an H pipe. Adding an H to a 383 car was a big difference in sound and performance Which I did to all my cars in the past. Take any car or exhaust you have and just add that H and hear and feel the difference. Just had a new Crown Vic Police intercepter on the lift Came with an H pipe..

There will be alot on this site that swear by x pipes . They have one ,They paid alot for it, And they look cool on a car. I just see no need to force my duals through a single and then back to duals. The early Cammaros and Novas did this with there mUfflers. And what did everyone do with them? Metal pile.

Mines not pretty but it works and it was cheap.