The first thing I notice is that they really pep up the car. I wants to be geared like this but it needs a 6th gear for freeway driving. If it did have another gear it would be close to perfect. I'm glad I didn't get the 4.10s, I think they would be too steep for someone who drives on the freeway regularly like I do. Plus, in first gear, my shift light comes on before I can even think to shift. I'll have to get used to that. I also now have to worry a little more about spinning my wheels in second gear. They do whine a bit so the car will be back in the shop this week to see if the specs held or if they can be tightened up. If the specs are still OK I may be asking Motive Gear for a new set.