I'm not looking to hijack a thread, or get into a pissing match over which is better. I've run both the stock style stuff and now on an HDK setup. I like both and I think there is a place for both. However, I want to clarify, "driving hard" on the street will never duplicate a road course or autocross. Nor is a complete aftermarket system required to have a car that is fun to drive. I do encourage you to find your local autocross group and give it a go. It's the most fun you will ever have in your car. You won't be the fastest, might not be the slowest, you will make mistakes, you will laugh your *** off, and finally, you will want to go again and again.