I am putting in a magnaflow cat back (#16869) and a smooth flow Y pipe tomorrow. I know I probably don't need the whole kit, but I was originally planning on doing it myself and thought it would be easier. I've read that I should keep the stock resonators and I've read that I don't need them. The shop guy says I don't need them. Should I be worried about the sound when the MDS kicks in? Will the resonators kill the rumble from the new system? I want some more sound for sure, but I want a good sound. What do you think? Thanks in advance.