3" downpipe on 2004 Audi allroad

adamss24

Registered User
As Per title, spent a good few hours making a 3" downpipe on a 2004 Audi allroad which has a few custom modifications: 15% larger nozzles, gt2052v hybrid with 60mm compressor, solid aluminium intercooler, alloy boost pipes, 4 Bar map sensor, etc. you can see from the pictures how restrictive the standard exhaust is particularly the downpipe with plenty bottle necking which creates back pressure !
 

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adamss24

Registered User
Thank you Sir ! I am doing my best...i enjoy fabricating !
 

nick75

Registered User
Looking good Chris, I've had a quote from an exhaust Co to do me a complete system they've recommended a 2.5" system with rear silencers. . Am very tempted
 

adamss24

Registered User
I would go 3" downpipe with 2.5" from the Y piece... The main restrictions are the precat, cats and downpipe- too many bottlenecks in the downpipe...
 
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