Ok I will be buying a Dr gas X pipe probably tonight.But I few questions first. ONE: will it bolt right up to my stock manifolds and stock catback? TWO: I will be installing a magnaflow SS catback not too long after, and will its flanges bolt right up? THREE: I have an 04 GT and will it work with 04s...their site says 99-03.SLP's catted X says that i need extentions for the O2 sensors ONLY on 04s, so do I need these on an O/R X, or do I not put the O2 sensor into the O/R? (BTW I know I need MIL elims) FOUR: Anyone have any dyno testing or experience with the Dr Gas X, and if so please let me know how much power you gained and your opinion about quality and such. FIVE: Where is the best/cheapest place to buy one. Thanks VERY much for your posts and help.