I just did the Gott's mod and added the Magnaflow cat back SIDO. I reset the system with the battery, do I still need to have a tune done? Also, I like the smooth, clean sound of the magnaflow, but it seems to be too high pitched for my ears. The volume is loudest at high pitch and gets annoying. Are flowmasters and borlas deeper than magnaflow? I'd rather have something that has more grunt than whine.