Y-pipe doesnt fit...
I installed my LT's myself too, when I put my y-pipe in I actually already had an adapter pipe that went from the stock 2.5 inch (?) to the 3" borla piping. I think it came w/ the catback that came w/ the car. What size is the I pipe on the catback?
You might just have to find a ride down to an exh fab shap and have em make a pipe.
i am not sure if the TSP has the flare or the cat back end will need the flare. if the TSP is flared, then all you got to do is put on a 3" piece on your hooker to replace the 2.5" and be sure they are still the same length. if the TSP is NOT flared, you will need to either buy a short 3" piece that is flared to mate to another 3" piece, or have a muffler shop flare a regular 3" piece for you.
your other option is to get a reducer to go on the TSP Y, but then you will create a bottleneck at the Y pipe/catback connection, not a good idea
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First we removed the ex mani's and the stock Y, and left the magnaflow cat-back installed (was already on my car). We installed the new headers first, then massaged the ory together. It wasn't easy, but nothing a little intuition, lots of elbow grease, and 10 minutes couldn't do. I still need to make some more room down there though. The headers or y-pipe knocks a little and its starting to bug the hell out of me.




