i was reading on here last night somewhere that if you have an four into one aftermarket exhaust your a/f screws need to be 2.5 out and shim your needle? i can't find the page again and my question is, how much do you shim your needles, and is this accurate... also what is the difference between a let kit and this mod? i have a 4into1 yoshi set-up, and stock needles, so if it's going to damage my bike i would love to address this problem immediatly. thanks , and ride safe
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