Ive had a hunt around for this info but still dont have enough to make my mind up. Have an A3 8P. Sold on the APR tune which im getting shortly but want to go with Stage 2 now. Mainly because my rear o2 sensor is playing up (will get the 2nd o2 sensor delete file) and the extra power would be nice. APR downpipe seems to be between 4-6x the price in my neck of the woods of the catless test pipe type downpipes that are on ebay. The ebay pipes seem to be direct copies of the ATP test pipe. I am happy with catless. GODSPEED audi a3 jetta golf gti mkv 2.0t fsi turbo downpipe new FREE SHIP | eBay Audi A3 2.0T TIG Welded CNC Machine Flange Stainless Steel Exhaust Downpipe | eBay Raceland also has a well priced option: Audi Downpipe | Audi A3 Downpipe Provided the ebay or Raceland options are made with a decent grade 304 stainless steel and have 3" diameter, mate up to my existing system fine and have decent welds; is there any reason I would go with an APR, Milltek etc?