Ok so I had the Longtubes installed last night. First off this upgrade is amazon, the car is so much more responsive than before, and the power can be felt at any RPM range. Soundwise, the engine just sounds so much deeper and more powerful.
Now the problem, the Longtube piping is 2.5 inches so the MRT exhaust will not fit. The exhaust is made to fit the v6 stock system, which is 2.25" I got lucky here since the shop I was getting this installed at, Draco Performance had already replaced an SS system, and had the stock SS system on hand. So we were able to install those mufflers for now.
That setup works for now, the sound is great at high speed, but the drone from the SS stock mufflers is ridiculous.
I am going back to the shop later this week, because there may still be a way to make the MRT V6 exhaust work with the 2.5" piping.