if you race just a few times a year but mostly drive on the street get the level 2 DSS bars for $549 and call it a day. If you want the car to be a heavy track car, get the Level 5's. I have launched my vert at least 50 times at the track with ET streets at 4k with the stock halfshafts and no problems. My DSS are going in this weekend just for peace of mind, I really dont think I need them though..