Toyota Supra Forums! Join the Supra forum! - 3" exhaust/2.5" wit not cats Hp Gains?

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supraman121

08-20-2007 06:09 AM

3" exhaust/2.5" wit not cats Hp Gains?

When you open up the exhaust 3" or you take your cats off how much horsepower do you gain, on stock boost pressure... 5,10,15 ect.?

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