TSP ORY fitment issues
My current setup is the same as yours. I am using the Borla 3in cat back plate system, Jet-Hot LT's and a Spohn chassis mounted TA with loop designed for LT's. I went with the Hooker 3in off-road y-pipe back when I was modding my car and had no fitment or clearance issues with the Hooker Y. Downfall is that the Hooker doesn't have the nice merge but should work with the TSP headers. Just a thought.
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Can you recall installing your y-pipe on any Spohn chassis mount TA equipped cars with no issues? Maybe there is a problem with the pipe itself that went unnoticed.
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Instead of blaming the part, maybe you should have a professional try to install it first.
TSP makes a great Y pipe and merge.
sepsis hit the nail on the head needing a good exhaust guy. Spend the extra 50 bucks if needed and get it on a lift, fit, and tucked. Bottom line is you very well may need to cut about 2 or 3" of the I-Pipe to get it to fit. I did and that was with a Magnamouth.
Otherwise I say best ypipe out there, the merge is damn nice and less rasp than other ypipe setups, I have the magnaflow catback and had to cut a little off the Ipipe, but that's the beauty of working on cars, each one has it's own unique "quirks"...



and I really want it to fit and work.....lol 



