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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