Changed nothing in the suspension. The tires are actually about a 2" larger rollout and are about 1" more section width. As for how long I run them, we replace them at the end of the year. I give or sell them off after that and I know of one car that is well OVER 200 MORE passes since I sold them on them. They do not go away on me I just get new ones every year. When we ran Goodyears I would have to replace them during a year as the 60's dropped off. This year I am up to 87 passes and counting. Racing this weekend at Jegs Sportsnats and one more divisional, the SCSN race and the Turkey race so we will be well over 100.