NC8 - Chambered Exhaust

[Unreal]

Alan,
I think I got one of your systems from D&R in Chicago. Was it 410 stainless, and supposedly made from the original tooling?
I'm happy with the system, just trying to confirm the story I was told.

[Jeff H]

Hey alan, is that chambered system 2", 2-1/4" or 2-1/2"? I want to put the chambered system on my JL8 crossram car when it's finished but I'll be running headers and would prefer 2-1/2" tubing to help it breath. I realize it won't be 100% stock original, but it will look period correct.

Jeff H. - 69 Z28 JL8, crossram and GM fiberglass hood, TI, radio delete, heater delete, 93 Z28 Indy 500 Pace Car - supercharged and for sale!

[Chevy454]

Well, I think the original were 2" (I think), so that is probably what Alan's are also. The chamber diameters are 3", but the inlet/outlets are only 2" (again, I think that's what they are...I am too lazy to measure ours and see!). The worst part is where it flattens under the cross member and right before and right after the last chambers.

I am kind of undecided if we should keep our chambered, or get the "correct" dual into transverse muffler type exhuast. I'm not sure which one would yeild better performance .

[Jeff H]

I know that there is one place making a 2-1/4" chambered system but I'd like to get a 2-1/2". I have plenty of time until my car gets to that point. I thought I remember reading that the stock chambered system cost the ZL1 80 hp.

[Chris396]

I had the transverse muffler type system with the resonator on my car before I switched to the chambered. I didn't notice any difference between the two other than the noise

[Belair62]

I actually though I picked up a bit of power...at least it SOUNDS faster !!!!

[YENKO DEUCE REGISTRY]

Chris396;
Before you installed the chambered system, did you happen to try removing the over the axle pipes, tranverse and tailpipes and just running through the resonators?? I am considering doing this with my car to see if it wakes it up any. I don't think my car car would make it into the 13's right now, but I have to learn how to tune it correctly. Last night I barely got a chirp out of second gear, and I had it floored shifting at 5500 rpm!! Timing, jetting and valve lash?? It was a very depressing drive, my only consolation was that Pete's COPO and Neal's Yenko Nova's have run mid 13's - that's my goal.
M

[Edited by YENKO DEUCE REGISTRY (10-19-2001 at 08:10 AM).]

[Chris396]

No Marlin I didn't but that is a good idea.

[Chevy454]

OK, I got to looking at my notes inquiring about the chambered vs. transverse exhuast systems, and it looks like the in/out diameter of the chambered is 2". So, if Alan's exhuast is copied after the originals, it should probably be 2" as well.

Now, you mentioned looking for a 2.5" chambered system. The only chambered exhuast that I know of that big in/out is for the late model '93-'99 F-bodys, offered by Braxton .

The biggest problems with the original type exhuast is the usual bends and crimps in the head pipes and tail pipes, in both systems. So, I'm not sure how much difference their would be performance-wise between the two. Now, if you could swap out the crimped head/tail pipes with something with a mandrel bend in it, then that should yield a gain.

[JoeC]

I see some guys using an "X" pipe instead of a cross over pipe. It is supposed to have better scavenging effect and a little more HP then crossover pipe.