Schroth Rallye 3 and 4, the choice of top autocrossers...
Schroth harness belts, like the Rallye 3, Rallye 4, and Rally 4 Quick Fit are very popular with the autocross crowd. They easily mount to stock seatbelt mounting points, so there are no holes to drill and installing them requires no modifications to your car in any way. They are also VERY easy to get in and out of, which is handy at an autocross where you will be getting in and out of your car many times during the day.
Why we think they are a must for autocrossing...
The factory seats and seat belts in most cars offer very little lateral support in high-speed cornering and braking situations like you'll find at autocross events. To compensate for this, the driver involuntarily uses the steering wheel or other stationary objects in the car for support. This results in body fatigue, and an interruption of driver concentration, as well as diminished control of the steering wheel. A Schroth harness belt will solve all of these problems. All of the Team SoloRacer.com race cars use Schroth harness belts!!
Schroth Rallye 3 in Acura Integra Type R
Team SoloRacer.com used driver and passenger side Schroth Rallye 3's in their old G Stock autocross car, a 1998 Acura Integra Type R.
Schroth Rallye 4 in a Subaru Impreza
Team SoloRacer.com racer Brett Setliff uses a drivers side Schroth Rallye 4 in his G Stock autocross car, a 2001 Subaru Impreza 2.5 RS.

Schroth Rallye 4 Quick Fit harness in a MINI Cooper S
Team SoloRacer.com driver Craig Wilcox uses a Schroth Rallye 4 Quick Fit harnesses in his G Stock autocross car, a 2005 MINI Cooper S.
Where to purchase Schroth Harness Belts...
Schroth harness belts like the standard Rallye 3 and 4, the RallyeCross, and the Quick-Fit Rallye 4's for BMW's, MINI's, and Audi/VW's, can be purchased on-line at the SoloRacer.com On-Line Store.