best Y pipe for the 4.3?

[markmitchinnh]

I read somewhere that some years of these vans had a bigger Y pipe then other years? Anyone have input?

[doyoulikeithere]

I do.
And it isnt just the Y-pipe, but the exhaust manifolds as well.
I've had a few Gen 1 vans from 1987 and 1990.
All of those vans had the same size/shape of manifold and Y-Pipe.
Once upon a time I ripped the whole subframe/engine/trans assembly out from under a 1995 AWD VIN-W Van (to build my 87 4wd).
I noticed that the exhaust manifolds were different that the 87s, and the Y-Pipe was also larger diameter than the 87.
I left those manifolds and Y-pipe in place when I installed that Vin-W engine/subframe/assy into a 1987 van.

I believe that the Y-Pipe differs in shape between 2wd and AWD (and maybe the manifolds too, I'm not positive).

Just FYI, I have never looked at the pipes/manifolds from a newer than 95, so they might be different too.

More input anyone?

[markmitchinnh]

Well I am buying a 95 vin w 4.3 with 80,000 miles for 300 bucks to go into my 89 Astro RS. but I don't have the Y pipe so I figured if I am going to buy one I would like to have the most free flowing one. The 95 engine is complete except for the starter.

[doyoulikeithere]

Probly cheaper to go to an exhaust shop that will bend you up a new one, than to find one from GM.
Or grab a 2wd y-pipe from a 95 at the P&P. My 95 had the CAT welded right to it from stock, and a 3" outlet.