Hello all.

I bought a set of TPI manifolds from a Trans Am with a 305 because I mistakenly thought that all TPI engines used the big ones. Imagine my surprise when the small ones showed up with another crap, useless y-pipe, just like the LO3 junk I already have.

So, what I need are some of the big manifolds. My 88 IROC has the big ones and I mistakenly thought that they're all alike.

This time, before I make a deal, I need verified measurements. It seems like the big ones are bigger than 2.10" and less than 2.25" I'd like a matching y-pipe too, but I'll buy a big y-pipe If I have to.

Thanks guys.

 

Almost forgot. I need a shipping quote to 33809 for anyone who has a set. Thanks.

 

Just an FYI: The only TPI exhaust manifolds which aren't the "big" ones are from a '91/'92, auto, 305.

 

That is supposed to be true, but apparently this 90 Trans Am that was formerly TPI had the LO3 manifolds and y-pipe on it. Apparently there is an RPO that you had to have with the TPI to get the big manifolds. I've read a ton of threads and posts around here about it, and that's why I just want them measured first before I pay.

That will solve all the issues quickly.

 

That's weird. And as you've said, the Y-pipe is different for each as well.

 

This thread gives a decent story. With all the threads I'm reading, it seems like from 1989 and older, the TPI gets the good ones along with the L69. From 1990 on its a crap shoot, with G92 optioned cars seeming to get the good ones, but TPI cars without G92 getting the cheap stuff.

https://www.thirdgen.org/forums/exha...0-exhaust.html

This is one is good, too.

https://www.thirdgen.org/forums/exha...manifolds.html

 

uhm why not scrape those and get headers

 

These LO3 parts WILL get scrapped, no worries there.

This build up is for my mom's car. She lives in a place where she has to keep a low profile, so no booming exhaust (like mine, hahahhaha.) I'm probably gonna use the OEM cat-back off my 88 IROC-Z with the 2 3/4" pipe since its not rusted out. I've got to run manifolds, bigger y-pipe, my 3" cat, and OEM type sound.

 

I will measure the manifolds I just took off 89 formula 305 TPI and post a pic later today

 

y-pipe too, please! And a shipping quote to 33809. Its ok if the y-pipe is cut up as long as the pipes are still there headed for the cat. From the cat back (including the cat) I have the rest covered.

 

sorry, no y pipe, I fabbed it up to fit the headers, cuz I'm too tight to buy an aftermarket one, but DAMN I should have.... ended up having 5 hours in that thing.....
looks like someone has drilled out the holes and slid long bolts all the way through the one manifold...

 

Have you got the spacer that goes on the RH manifold? The tapered piece that allows the pipe to hook up?

 

 

Can you pm me a shipping quote to 33809? Those manifolds are what I need. Thanks.

 

do you have a preferred shipping method?? and how fast do you want them??
this would be easier during the week if done by email, if you don't mind...

greggbruceauto@gmail.com

 

Whatever is cheapest, and I don't mind. Watch your email.

 

Good feedback left for greggbruce. I got my big bore manifolds today and they are better than the pictures.

I'm moving forward now, thanks!

 

Glad they are what you wanted !! Enjoy !!