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Header Install


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ok..so ive been wanting to install some headers on my gs300...but it really seems like a pain with the o2 simulators and everything...and i was wondering why you even need o2 sims? they say the check engine light will come on...but i dont really understand why..(and this is keeping the stock y-pipe...so it doesnt have to do with the cats) any input would be great

thanks

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