hello i am currently building a custom true dual exhause and i am looking to replace the rear stock cats with high flows but don't know what to go with i am basically concerned with what will fit the best and 2.5 inch. i looked at pypes universal high flows and look like good product and reasonably priced, any advice will help on this thanks. i just figure might as well throw high flows on while im at it think its worth it and wonder how much it will change the sound and performance cause i completely eliminated mine on my srt-4 and wow is all i have to say but i would rather high flow than delete it.