Exhausts are one of the hardest things to gain power in right across the rev range in an. Either you lose alittle in the midrange and gain some up top. And it's very easy to make less power than oem. Most Jap systems work well but do require engine mods to perform at there best. That's why most are offered in 65mm and 70mm diameters.
i see i might look into getting toda headers then with the invidia n1's.. considering invidia have a header set, wouldnt that add good power? with the n1's that is. btw what exactly would cel fix in a test pipe do?
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