TBI Exhaust

The 92 Cruiser goes in for exhaust work on Wednesday. I've got a 9C1 y-pipe, and a 3" in/out cat on the way. I also have a 2.5" in/out Summit Turbo muffler. My thought was to have the pipe 3" up to the muffler, then reduced to 2.5" from the muffler back.

But I started thinking (always a bad idea). Would it be better to have a 3" in/out muffler and just keep the exhaust 3" all the way back? I already had this muffler which is why I was going to use it but figure if a 3" one will be better, I should get it done right the first time.

Now I know this is "just" an L05 here and I don't expect a huge change. Just figure if I'm going to the expense of having pipe bend, may as well do it right.

Thoughts?

There's not enough room for a 3" OTA pipe. Go with 2.5". It's not going to be a noticable difference.

And isn't the 9C1 Y-pipe 2.75"?

My thoughts are go 3" all the way, that is what I did on my 93

and you can judge the sound for yourself

Well, turns out the muffler I had was a center/offset muffler, not an offset/offset. So had to buy one anyway. So I now have a 3" Summit Turbo and a 3" cat on the way.

Bill, I think you're right, I measured the output on the y-pipe and it is a tad under 3", so 2.75 is probably about right.

So Pat, how tight IS a 3" pipe over that axle?

I'll try to get a video clip once it's done. Got the Caddy intake done a week or so ago. Quite a difference actually, I was a bit surprised. Certainly sounds better.

Nice! I can't wait to hear it (and see it!)

Well, the exhaust is done, finally.

Looking back:


View from behind:


The bender guy was supposed to exit the pipe in the stock location. Apparently he had "problems" and naturally this was done while I was out of town. I was going to just leave it as is since I don't mind the look. But realized while taking these pictures that the tailpipe will interfere with the hitch I plan to install. So eventually it'll get relocated.

And the sound:

the Malibu in the garage looks clean in that video mike....














and the CC sounds nice

Yeah...it has a nice tone to it.

Are those pipes mandrel bent?

Oh...and why is the cover not on your WB4?

brokecello wrote:

Yeah...it has a nice tone to it.

Are those pipes mandrel bent?

Oh...and why is the cover not on your WB4?

I like the sound of it, thanks. But a bit more noise inside the cabin than I want. Yes, they are mandrel bent pipes.

I drove the WB4, it was so clean and shiny I had to. Then it got dusty so I couldn't cover it and haven't had time to wash it yet.