jvandyke

Stock muffler exploded (spectacularly!) a while back. Original 12a, PO took out cat and put in what appears to be a glasspak. Whole system is a cobbled mess. Thinking universal RB, 2 or 2.5" diameter pipe all the way back from stock manifold. Supposedly some PO did a street port but don't really know. If it still sounds bad, can go back and add a presilencer I guess. Good plan?

Ya know, I'm not even sure it's a stock manifold, could be a header of some sort.

nff

if its a big chunk of cast iron then its a manifold. if its 2 pipes its a header.

jvandyke

It's probably a header then, not sure what a stock manifold looks like. I haven't looked that closely, maybe the owner is watching this thread and he remembers, I'm just his mechanic.
If this is a 12a stocker, then we ain't got it, must be a header.

steve84GS TII

Ive only seen one,(in a wrecking yard) but there are some FB's that have a factory "header" manifold, instead of the heavy reactive iron manifold. Its basically an unequal length, heavy steel header...... might be on some Fed or Canadian cars.

Jeff20B

iTrader: (13)

Steve, you might have seen the 6 port 12A exhaust manifold. It looks like a mini header. It has a backpressure or emission sensing tube inside like the FC manifolds do.

jvandyke

Looks like a Pacesetter to me. 1 7/8" pipe in most places. I think we'll do a RB universal with 2.5" inlet, all 2.5" pipe from header back to it and if it sucks, cut it and put in a presilencer. Plan?

NCross

iTrader: (18)

Just buy the rb system second hand problem solved. Pacesetter is garbage and will rust out. Sounds terrible. Flows bad. So in short... Find a second hand rb header and silencer. Then take your stock muffler in for parts to a welder and an rb universal muffler. He can cut the flange and mounts from it.