You wont gain anything with just an oversize header....you need to open up all the way throug... Airbox/filter, rejet carb and open the exhasut or use a aftermarked one.
I've got the one from kedo, and like it. Havent tried to put the original header on, and see it theres a difference. I did the swap cause my headers vere rusty. It I gain any torque/Hp its just a plus.
I havent head it should't be legal, i mean, how can anyone teel that, and why shouldn't it be? Cant see it, dont know if you have speacial laws regarding that.
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