..... I just installed the stated exhaust system. Any suggestions on carb settings? Fuel screw etc.? 03YZF450. .....I can say that with the stock header and a PC T-4 slip on, I got popping under deceleration. More than I heard from other YZF's Just enought irritate me into attempting to dial it in. I had read some where that if I adjust the fuel screw it remedies the situation? Any infor would be greatly appreciated. Thanks, -Spode.