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| Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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05-03-2015, 11:41 AM
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#1 |
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cattback 2,5" or original diameter exhaust?
Hello !. I wonder if power is lost at low rpm to install exhaust 2'5 "behind catalyst.
Thanks  axleback have 2.5 installed. Only I need to put mid line of 2.5", but not if it is advisable or not. |
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05-03-2015, 04:01 PM
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#2 |
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I thought that the stock diameter was 2.5"? TBH, I doubt you'll notice that much of a difference.
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05-03-2015, 04:41 PM
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stock is 2.125" so a 2.5" catback will give some small gains even without a tune
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05-03-2015, 04:57 PM
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ok, but not lose power at low rpm by lower back pressure?
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