The only modification are the rims from a Lexus IS. A spacer was needed for clearance of the from steering. I've had my Daewoo for 6yrs and it has been a very reliable car. As far as any major service repairs;timing belt. I currently have 151K miles. THIS Daewoo runs smooth just like me, the owner. THe Lexus rims ride on dunlops 225/45/17 (sport901) I tell you, these fricken tires are the best tires i've had on any of my cars. Tight steering;no problem, noise;none, Tire itself; very sporty.