Exhaust Back Pressure

[vbb71zoso]

My latest machine (82 200) starts, idles, but when you throttle up, it runs rough. The most obvious thing is the loud aftermarket exhaust system. It didn't have a baffle in it and it was leaking where the header joins muffler. Think this could be it?

As always....Any advice would be great!

[steven 250sx]

if it has a loud aftermarket exhaust, did you rejett your carb? or did the guy before you did it? with out the baffle in it and an exhaust leak it'll make it louder what is the make of the exhaust?