3inch down pipe into 2.5inch catback ? 2.0t b7 a4 - AudiForums.com


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Old 03-20-2017, 06:14 PM
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Default 3inch down pipe into 2.5inch catback ? 2.0t b7 a4

I'm getting ready to put an exhaust on my car and my downpipe is larger than my catback, both are advertised as 2.5 inch but I believe the downpipe is more like 2.75". I can put them together with a welder, my question is should I be concerned about a power loss or some sort of flow issue ? The car is ready for stage 2 post the exhaust, once that is on I have the flashed ecu.

Thanks in advance

Nick
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Old 03-21-2017, 04:53 PM
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No input on this ? My downpipe is 3inch at the turbo and drops down to 2.75 at the flange, is there any danger of "bottle necking" if I use a 2.75 to 2.5 adapter to get on to my 2.5 inch cutback ??
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