Not to offend anyone here that have used Amd but I wouldn't recommend them at all I used to have a golf before and there remaps just didn't sit right with the car was running lean and had a few problems this is just my own personal opinion through experience, give rtech a call they do mobile remapping stage one Ben did my Audi and was the best remap I have ever had, also the exhaust would help flow better but standard exhaust was perfectly fine with my stage one and never changed it till I went to stage 2 so I would say just stick with it, a decat or sports cat would be a better idea IMO good luck with the remap!