LS1TECH - Camaro and Firebird Forum Discussion

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-   -   let's see your 4" catbacks... (https://ls1tech.com/forums/generation-iii-external-engine/1889659-lets-see-your-4-catbacks.html)

ls2 bait Jan 15, 2018 04:25 PM

let's see your 4" catbacks...
 
Since 4" is to small a phrase for the search and adding catback add every catback let's see what you have. I have an idea but I'd like to see what others have done.

Full-Force Jan 15, 2018 04:48 PM

I will be putting my 3.5" TSP on the car this weekend. Not 4" but it looks like a nice kit especially with the 3.5" cutout and the big 4" corsa clone tips

Full-Force Jan 15, 2018 04:50 PM


Originally Posted by ls2 bait (Post 19811426)
Since 4" is to small a phrase for the search and adding catback add every catback let's see what you have. I have an idea but I'd like to see what others have done.

from what i remember years ago you had a pretty sweet hand formed merge with 4" through a magnaflow out back with turndown right?

ls2 bait Jan 15, 2018 05:05 PM


Originally Posted by Full-Force (Post 19811443)
from what i remember years ago you had a pretty sweet hand formed merge with 4" through a magnaflow out back with turndown right?

I’ve had a few different set ups. First was a flowmaster 4” merge into a corsa. Then a custom built y into a corsa. Then into a dual dual. Now American racing into a dual dual. It flows well, I only pick up 5rwhp with the cutout open, but the car rarely gets driven lately I don’t mind if it’s a bit more rowdy. And some of the packing in the muffler has found it’s way out of the muffler...

Full-Force Jan 16, 2018 10:56 AM


Originally Posted by ls2 bait (Post 19811456)
I’ve had a few different set ups. First was a flowmaster 4” merge into a corsa. Then a custom built y into a corsa. Then into a dual dual. Now American racing into a dual dual. It flows well, I only pick up 5rwhp with the cutout open, but the car rarely gets driven lately I don’t mind if it’s a bit more rowdy. And some of the packing in the muffler has found it’s way out of the muffler...

got a pic of your latest setup?

stp001 Jan 16, 2018 10:15 PM

Full Force, Don't get too excited yet. You have to get a 3" to 3.5" adapter slightly enlarged on small side welded on your y-pipe. You also have to cut the 2.5" section of y-pipe off to lose the restriction. TSP will tell you it hooks right up, but it doesn't. If you have one already, good deal. If not, shoot me a note and I can tell you where to order one. In stainless, it wasn't easy to find.

Full-Force Jan 17, 2018 11:38 AM


Originally Posted by stp001 (Post 19812393)
Full Force, Don't get too excited yet. You have to get a 3" to 3.5" adapter slightly enlarged on small side welded on your y-pipe. You also have to cut the 2.5" section of y-pipe off to lose the restriction. TSP will tell you it hooks right up, but it doesn't. If you have one already, good deal. If not, shoot me a note and I can tell you where to order one. In stainless, it wasn't easy to find.

I modded my y pipe weeks ago. It now has a 3.5" merge on it. I cut about halfway up the merge and then wrapped a 3.5' pipe around that area so it goes from oval to round.

I will try and snap a pic of it asap

Full-Force Jan 17, 2018 01:22 PM


Originally Posted by stp001 (Post 19812393)
Full Force, Don't get too excited yet. You have to get a 3" to 3.5" adapter slightly enlarged on small side welded on your y-pipe. You also have to cut the 2.5" section of y-pipe off to lose the restriction. TSP will tell you it hooks right up, but it doesn't. If you have one already, good deal. If not, shoot me a note and I can tell you where to order one. In stainless, it wasn't easy to find.

defeats the purpose of a 3.5" catback if you are going to neck it down to 2.75" in the y pipe ....

stp001 Jan 17, 2018 03:10 PM

I will try and snap a pic of it asap[/QUOTE]

I apologize for interfering. It would certainly appear that you have the situation well under control!

ls2 bait Jan 20, 2018 05:09 PM

Sorry I don’t have any pics of my current setup. But man 4” exhaust sure must be rare!

Full-Force Jan 23, 2018 10:25 AM


Originally Posted by ls2 bait (Post 19814828)
Sorry I don’t have any pics of my current setup. But man 4” exhaust sure must be rare!

Because everybody is drinking the duals kool-aid ...;been there done that.

A good large diameter single pipe with good merge makes equal power and retains the sound.

Full-Force Jan 23, 2018 10:55 AM

My car never ran better than with this exhaust I made!


https://cimg2.ibsrv.net/gimg/ls1tech...1a927eb860.jpg


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