Looking for advice on exhaust system.

That is the issue for me. I would like SS 2.5" exhaust from factory 340 manifolds to factory tips. I have only found TTI offer this complete set in non-stainless. Both Pypes and Flowmaster offer SS set but are header back style.
Have you talked to TTi about custom bending your complete exhaust in stainless steel? They did mine in 304, still looks new today. They said just add "SS" to the end of the item number.