I just bought a 2012 5.0, my first GT! I am wanting to run the MBRP Race Serious cat back. Since I don't need to have emissions were I live, I am wanting to run an Off road H pipe. I have been looking around and found the Pypes off road H. Would this been good to run the pypes O/H-pipe with my MBRP race series? I talked to a guy with a 5.0 and he said that running two different manufacturers isn't a good thing. Is that true?