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do i really need an aftermarket header pipe?

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do i need an aftermarket header pipe or will a slip on perform good enough. p.s i am looking at a procircuit t-4 on a 04' crf250r

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I won't lie... I run an aftermarket header 'cause I like they way they look. There are performance gains to be had w/ the right header though.

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There are performance gains to be had w/ the right header though.

Do you have any dyno sheets to backup your claim?

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