So the S4 has now gone and been replaced with a 15 plate 530d which does everything I need it to for the road, it's quick enough, economical enough and well specced. But I miss the S4, I have an E36 compact that I'm about to build into a track car, I have a 2.8 six pot, cams, inlet, LSD, etc but I'm now thinking is this what I want to build?? Previously I had a mk2 Golf 16v which I build and loved it. I'm now thinking of an S3 (1.8T) or I can get a TT 225 cheaper. Which would be better as a fast road / track car, are they the same underneath? Don't want to spend mega fortunes.