Fitted a new Forge TIP on my A3 AGU K03s, car pulls much better and smoother.
New 312mm brake discs and S3 calipers/carriers...does make a diffference. I only need new pads (anyone recommend some)
then fitted an Audi TT gearshift. Makes a very noticeable difference. Less throw (iirc, 20-30%)
next mod- exhaust and downpipe and arb