So i want to replace my header and cat with a neuspeed n2 (or dc), and carsound/random high flow cat. I would just like to know if the thermal piping is 2.5". Id like to be able to just bolt on the new cat with the new header and no other mods. The info for the cats tell of a 2.5" inlet and outlet. Hopefully it'll all match up. Any advice is very much appreciated!

My flexpipe and cat have leaks and my exhaust sounds like apple splatters.