I've heard the stock Y pipe is junk... I'm getting my catback put in soon and the cat is gonna buh bye... Should I look for a new Y pipe as well, to make the exhaust package more complete? I'm strapped for cash right now with the other mods I want to run...is there a Y pipe for a specific car that I can pull from a junkyard that will be an improvement? Thanks.

 

If you want a nice boost, try to slide the donuts out from between the exhaust manifold and y-pipe connection. There's a sharp ridge in there. I filed mine down with a round metal file, and used an air grinder to finish it off. I felt an extra kick in the butt.. I was suprised, didn't think it'd make much of a difference. Didn't Karl say to pull a y-pipe from a blazer?

 

I thought Karl mentioned a 4th gen Y-pipe?

 

Just gimme a pipe to look for and I'll scour the local junkyards...I'm sure I can find something.. So it does make a difference huh?

 

Here's what I suggest.
BOTH DESIGNS
Why?
The 4th Gen stuff is primo large & efficent yet needs detail work (muffler shop) to place on your ride. BUT it's "newer" and is good GM pipes stuff. The newer pipes can be made to fit (labor $$)

The Blazer.
Why?
The "Y" pipe junction is a decent smooth flow.
Try to mimick that smooth "Y" junction.
Me?
I have both options & I await headers from the CARB people.

YET any decent mufler shop will make you a good set of pipes at probably the same price as gathering something from a yard & chopping it up.
Ask the yards for their newer model year car. I'll bet a 3.8 powered F Body "Y" Pipe section would also be a good place to start, too.
SOME PLACES won't be allowed to sell that piping section due to emissions laws.
California wrecking yards won't sell ya a used cat convertor for instance.
I got lucky with my purchase of the 3.4 engine & the request for the "Y" pipe section was included.

 

So keds let me ask this. As you know I m putting a 3.4 in my 91. But I got the whole car that the 3.4 is coming out of. So that was one of my questions. Could I use the Y-pipe on my 91 w/ the headers I got. And I was looking at it the other day. And noticed that the 93 had a high flow cat on it. Seeings how I already have it. I might as well use what I can wright? Too cut down on some of the cash coming out of my pocket.

 

which headers you got? I too have the 3.4 Y-pipe, but hopefully I will be getting the C_H_D brand headers soon :rockon:

If shorty headers like his, I think a competent muffler shop should be able to fab the two to fit. I'm going to look into this.

The biggest obsticle those who haven't seen the 3.4 Y-pipe, is that in stead of bending/curling around to meet the cat, the pipe goes strait back. just something to ponder, the the newer pipe is worth the $$ it will take to make work.

edit: also forgot, the 3.4s have two O2 sensors, mounted inthe exhaust manifolds, 0 (zero) in the pipe. Have a new bung welded in. I'm going to experiment some w/mine & attach the wire to the pass side O2 sensor & see if it throws any codes or just runs like crap.

 

One way to find out for sure.
Go to parts store.
See if part numbers same for 1985 Oxy sensor & the 1995 oxysensor.
Curious.
Use what ever ya can to get on the road.
YET the stock V-6 "Y" pipe design sucks.
Fix that flow & EVEN keeping factory manifold logs gain ya about 5-7 HP all thru the RPM range.
Just use what ya got.
Any decent myuffler shop can do thi job.
FIND a great chrome end tip, split exhaust pipe. That's what ya need make.

 

There's a few muffler/specialty shops around here that I might be able to get to fab me up a Y pipe..thanks for the input. I remembered hearing something about how the stock Y pipes were ****ty, so I wanted to double check... I want this thing to breathe not hiccup and wheeze....

 

Honest.
I just layed down about 40 feet of a one leg turn burn out
With the AC on Full Blast.
You will gain HP by
Swapping in a 3.4
And
By making a smoother flowing "Y" pipe junction.
You won't be loosing power, just won't be as much as it could be with a smoother flow "Y" pipe.

 

O2 p/n's same, 94 jusst has two of them.

edit: that means I have 1 spare , or If I have to put a sensor in the stock location, I'll have 2 spares.

 

There ya go!
But NOT a problem.
Thanks for letting me know.
Good ol GM.
Love how they save money on these generic cars of theirs!
Imagine if we had Chryslers?
Talk about car specific parts!

 

I bought headers from Camaro_Hunter.......And I got that Borla cat-back system to boot. Just need to finish some odds & ends on the 93 before yanking it out. And making a test fit of the headers.