Will Magnaflow's cat back 16795 work with a GXP? I bought the system with getting a GT in mind but wound up with a GXP.

It should fit.

Let me know how you like it, that catback is high on my list for exhausts.

I took a look under the car and it looks like it should. I am going to call Magnaflow Monday to make sure. If all is good they should be on by the end of the week. I will let you know!