I bought the Hellwig pro-touring RSB and couldn't be happier! I mainly bought this to help my launches at the track, but it completely changed the car on the street as well. My suspension is otherwise 100% stock V6 stuff. I had a factory rear sway bar and it didn't seem like it did anything. With the Hellwig unit it launches flatter, corners WAY flatter and still rides great. I didn't think the RSB alone would make such a difference. I'm so happy I'm ordering a new front sway bar and 4 new shocks. Just wanted to share this...