Originally Posted by Memphis370Z

With just bolt-ons, go with the tune. I've been using EcuTek for a year-and-a-half, and it shifts quick and hard under heavy throttle, but is still smooth when driving normally. Especially in auto mode. Under WOT, the rear will kick out going in to 2nd, and I chirp 3rd. Additionally, EcuTek will give your tuner the ability to hijack the oil temp gauge so that you can use it to adjust the traction control.