Now take car to deserted road , park , clutch in , select first gear , rev car to 5500 revs , drop clutch . oops 245 wide tyres grab a handful of tar , revs drop to idle and car moves off sedately .Stress on drivetrain is immense .Even the 328i when tested at the reef with standard 15 inch tyres and 17 inch tyres was slower on acceleration and top speed with 17 inch wheels .The 4 cylinder e36 models have good balance and turn in , they have less mass on the front wheels than the 6 cylinder models .IMHO try keep the car with its positives being kept good and do not put too much rubber on the road for instance , how often do you corner that you need the extra grip ?