I know my car isn't Quattro, but it does have a Quattro downpipe on it... specifically this one:
Milltek Sport Downpipe AUDI A4 QUATTRO 1994 - 2001 1.8 MTKB5A4QDP
Cheapest price you're gonna find on a quality brand new one, and free shipping! I had my exhaust guy cut the pipe a bit shorter and weld on a flange, and he built the rest of the exhaust starting with a mating flange at that point.

It took a while for me to get the downpipe because they are drop-shipped from the UK.

As for size of the downpipe, Milltek exhausts for this car are 2.75in, but for some reason I think my Milltek downpipe is 2.5in. I could be wrong though.

 

Meloman- eBay is not working out man. All I see is downpipe/ testpipe. And it's usually 3" to2.25/2.5"

Metalman- thanks for the info. Price is good.

I'm curious to know, what the guys that have gone custom 3" have done? Have they just bought their DP and went custom for the rest of the exhaust?

 

Ive had the VAST piggie DPs reccmended to me and on these forums Ive seen them talked up abit as well. Would there be any reason to NOT go with those? Theyre priced incredibly reasonably it seems as an alternative.

https://vastperformance.com/index.ph...-2-7t-360.html