Bigger Restriction:Exhaust size or Cat? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 10-23-2006, 10:24 AM   #21
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I used a 2.5in enthuza and then moved to a 3in enthuza, and I felt like I might have gained 100rpm of spoolup and maybe 5whp. This is on my car on 12psi and pump gas, so maybe when the boost is raised to about 16-20psi I would be feeling more of a difference. I say if you do it once just make a 3" exhaust and then you can sleep at night.
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