"X" or "Y" ?

[CharlesBrown]

I’d like to hear from someone who has installed either an x-pipe or a y-pipe with balance tube crossover such as the one from MAM. The idea being to reduce (eliminate?) the extreme resonance inside the car. As I look at the underside of my (100% stock) C-4, there are two separate exhaust pipes running from either side of the engine past the transmission. Then, they join just behind the tranny. Isn’t this connection an x-pipe? So a second x-pipe perhaps 18” further on is supposed to eliminate resonance? Then there’s this so called balance tube. The only way the exhaust gas is going in that thing i.e., making almost a 180 degree turn, is to have a fairly significant pressure drop across the tube—which I doubt. However, stranger things have happened, so if anyone has had any success with either of these devices on your early C-4, I’d sure like to know about it.

 

[grapeknutz]

I have replaced my resonator with a X crossover and the resonance was eliminated and the tone was even quieter! Go figure!

 

[ZumZum]

Your L98 has a front y pipe (from manifolds to the single pipe) and rear y pipe (where the single pipe splits back into 2 for the mufflers).

An X-pipe is only for cars with true dual exhausts installed. I know the rear y-pipe with the cross over you're talking about (as sold by Mid-America, etc), but I have no 1st hand experience with it.

The theory with an x or h pipe is that the exhaust pulses from one side will help scavenge the exhaust from the other. Since the cylinders don't fire at exactly the same time there will be a pressure drop from one side to the other. However, most x-pipes are installed towards the front since ideally, they should be placed approximately where the exhaust is the hottest.

 

[PLRX]

X Pipe.

Magnaflow makes a resonator with the X inside

 

[ZumZum]

X Pipe.

Magnaflow makes a resonator with the X inside

That will only work with the LT1 or 4.

It won't work with CB's L98.

 

[BlackIce]

Y pipes are stock. I ran true duals. No X pipe either. Straight from the front to rear. No mufflers either. Sounds mean!