Well, when I first bought my '99 GT in Sept., the first mod was an x-pipe...fine - sounds great (on its own), and noticable power bump....then I welded some Flow 2s on and WHOA - MUCH louder than I wanted, though it did sound nice...just too damn 'big'!? Soooo, I took the x off and kept the Flows, as they're welded in and I didn't want to start from scratch - ie new straight thru mufflers, etc....my question is, I love the power gain from the x but I need a little more peace, especially cruising on the highway...the drone! What I'm thinking of doing is getting either 2 resonators welded in either near the mufflers end or the headers, whichever is more practical, or 2 generic/basic cats....will this significantly lower the overall volume when put back in or should I just forego the x if it's too much?? If the stock exhaust were a 4 in noise levels, a 6 with the x only and a 9 with the x and Flows, where would this alteration put the noise level on a 1 - 10 scale?? Any help or experience alterring these pipes is MUCH appreciated. Todd