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Old 29 September 2011, 01:06 PM
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Truss
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Default 2.5" or 3" exhaust
I own a 2004 STI and im wanting to get an exhaust sorted for it. Im going for a cobra backbox to start with, and gradually get the whole system done (without the missus noticing ).
Question is, what size pipework do i want? the aim is to mod to 350bhp eventually and don't want to get the exhaust wrong!
any help is greatly appreciated!
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Old 29 September 2011, 01:16 PM
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2.5 will be fine at that power level
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Old 29 September 2011, 01:20 PM
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As above 2.5" will be enough,if you will going above 400bhp i would go with 3"


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Old 29 September 2011, 01:21 PM
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sorted, i thought the 3" would start to lose torque.
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Old 29 September 2011, 01:44 PM
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Just put the exact same question on!!!! Just helped me a treat as buying a cat bcak system of Ebay
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Old 29 September 2011, 04:18 PM
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Haha! i must have been writing at the same time as you!
Anyway, 2.5" box with 4" tip from cobra is ordered, hopefully unleash the burble!
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Old 30 September 2011, 11:42 AM
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Same here. But got a H&S one, pretty much spanking new off eBay for £120!!!!
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