New Yosh Exhaust

I just got the new TRS Comp exhaust. Now I can't get my bike to run right. I fouled 2 plugs in 15 min of riding. I changed my jetting to a 160 main and up 1 clip on the needle. is that normal to go leaner on aftermarket exhaust. The bike is running better. It still sputters at half open throttle (sitting still). The plug also still has some carbon on it(not as bad).

Please help



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