Is bigger better? (downpipes) - 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 05-10-2008, 03:33 AM   #21
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I fabricated a 3" downpipe using off the shelf circle track exhaust components. Cost under $100, has performed flawlessly for the last 10 yrs.

Start with a turbo outlet flange > 90 degree section > straight 3" pipe > 45 degree section > 3 " header flange. Dont forget to add 2 O2 sensor bungs.

The same tubing can be used for a intake setup.
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Old 05-10-2008, 04:24 AM   #22
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IIRC, Corky has discussed no more than a 15 degree swage out from the size of the turbine exducer to the size you want for the exhaust. AKA: Start at 2.25, swage to 3, and run 3 to the tip.
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