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| RX-7 1st Gen Specific (1979-85) RX-7 1979-85 Discussion including performance modifications and technical support sections |
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| RX-7 1st Gen Specific (1979-85) RX-7 1979-85 Discussion including performance modifications and technical support sections |
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09-20-2008, 12:21 PM
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#2 |
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Rotary Fanatic
Join Date: Feb 2008
Location: Gresham, OR
Posts: 473
Rep Power: 18  |
2.5" at most. 2.25 would be better.
too big slows exhaust velocity, creating backpressure. you dont wanna use pipe any bigger than the outlet of the header. also, you dont want the pipe to get bigger or smaller as it travels along. thats why crush bent sucks (smaller volume in the bend). you dont wanna use pipe any bigger than the outlet of the header.
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