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Old Mar 19, 2014 | 05:25 PM
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So bought TSP headers only to realize later that all of there y pipes have a 2 1/2 inch exit? well its my fault for not researching I guess but will any other y pipes work with these headers?
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Old Mar 19, 2014 | 05:44 PM
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So where the y merges into a single pipe is only 2.5"?
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Old Mar 19, 2014 | 05:52 PM
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Not at all. It's actually 4", but necks down to accommodate a stock exhaust if needed.

It's a simple 20 dollar mod, and for me, that included the stainless tig welding. Take a look here in a thread of mine.

https://ls1tech.com/forums/generatio...tall-pics.html

The part # and where to get it is on page 3
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Old Mar 19, 2014 | 08:26 PM
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Oh i see...yep I did something very similar to dr whigham with my setup as well
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Old Mar 20, 2014 | 01:08 PM
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I believe it's actually 2.75" OD. If only TSP would address this with the clamps they supply in the kit... all 3"!

Further, all catbacks will be 2.75" ID so as to work with the factory y-pipe -- even if they are 3" immediately after.
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Old Mar 20, 2014 | 05:10 PM
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Originally Posted by demonspeed
Further, all catbacks will be 2.75" ID so as to work with the factory y-pipe -- even if they are 3" immediately after.
I modded that part too... Another 7 bucks

But yes, agree it's actually 2 3/4"
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