To answer you question though yes. If im not mistaking the first gens came factoy with a 1 in W out or duel tip. But as i found out that bad boy gets clogged it is hell on the engine same thing with the cat if you have high miles i would be willing to bet that the cat is done for. Once they clogg up on you you start building far too much back pressure. The goal is to reduce the back pressure as muchas possible. And i mean it when i say it ....... It makes a hell of a difference
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