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I have gone through many different types of exhaust setups, and to my findings anything smaller then 2.5 just will not work well for free flowing, no restrictions on rpm performance...If you want to get the max power out of your car...Go with 2-1 header collector and then merge those pipes to 2.5 inch dual or to 3 inch single...The rev will be clean, there will not and won't be no restirictions on rpm...Just a little loss on back press. and a little noise...
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 One Turbo At A Time
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