Nothing outside of cosmetic. ( hence I didn't get any of the dealer rapesessories.) There is no performance after market for the 350, and no engine mgmt. at all. I really like the new darker rims also. And the new trac button when held in for 5-10 seconds disables the VDIM now. So the car is almost fast! In stock trim.
This will be my everyday driver now. And the IS 300 will be trailored to the tracks now. My wife is much happier about it. That's for sure. She was kind of complaining about the ride being to stiff, and the car was too much of a hot rod now, and so on. And with me wanting to go even bigger power, meant that the car would be down for an extended amount of time, and then put on the track, so the little Nissan was going to be getting alot more street time. UUUhhh, not gonna happen. So, I went to the dealership and we played stratego, and I bought a new Lexus. I have to say, I really like the new IS 350. I'm very satisfied with it. I think it will perform it's duties very well. And when I want me ribbs pressed to my spine, I can allways bring out the monster for that. LOL!!