The B5 S4 is a great car. I had mine for over 8 years before selling it to get a 335i. The Audi and BMWs are very different cars, but both are a lot of fun in their own way. Mine did not have the mods listed in the car you are looking at but it appears whoever did that too it made good choices. APR, AWE, and GIAC are all popular mods for the car. The reason I let mine go is it was starting to require many of the fixes listed. (Ironically one of the more frustrating items to get fixed was the fuel pump.) It gets very expensive...and unfortunately on more than one occasion, I was left stranded. If it is not your only car you own and you have the funds to continue to maintain/fix a 10 year old car...I would say you will be happy with it. Keep in mind after a couple years of fixing it, you may be able to afford a CPO 335 too. Nothing like it in the snow....as long as the snow was not deap, there was no stopping it. Good luck with your purchase if you decide to pursue it.