Our cage builder follows or exceeds the SCCA GCR (rulebook), and has built many full race cages. The cages and 4 point kits are built out of the appropriate size DOM tubing for the weight of the car. He is meticulous to ensure the number and radii of the bends are correct, and his welding skill is incredible. Long story short, any 6 or 8 point cage he builds will be SCCA legal for road racing. If there are any additional requirements for a different sanctioning body, we can meet those requirements as long as you let us know what they are.
A 4 point kit is not legal for SCCA road racing, but it can be added on to create a legal 6 or 8 point kit. In the case of our supercharged SHOs, we decided to create and install the four point kits for use at open track days for the following reasons:
1) I realized my wife (the race driver) was hitting 150+ on the front straight before the brake zone
2) The 4 point kit will give some rollover protection, but still allows you to get in the car more easily (no door bars)
3) The 4 point kit gives you an excellent anchor point for the 6 point racing harness and racing seat so we can use a HANS device
To answer where the 4 point are:
1) The kit comes with the main hoop preassembled and installs to the unibody close to where the B-pillar meets rocker panels and floor (it does not attach just to the floor) - this is 2 points
2) The second two points are the rear braces that are precut to fit between the main hoop and the rear strut tower tops. These two tubes are shipped loose to allow for shipping (and because they need to be welded in place as you could not get a fully assembled kit through the doors) - this is the other two points.
Most of our kits have straight rear tubes because that is required for a legal 6 or 8 point cage. The straight tubes limit access to the rear seat, but we also do not recommend people sitting in the rear seat with a cage because they could injure themselves on the cage in an accident.
A harness bar is a single horizontal bar that mounts between the B-pillars to allow for mounting shoulder harnesses. Many harness bars are removable on street cars, and we can look at making ours this style. Personally, we prefer the 4 point kit as a minimum since it is much stronger and safer.
A link to our SHO 4 point kit is found here
http://shosource.com/catalog/product_info.php?cPath=61_7_14&products_id=124 I do see that the picture only shows the main hoop, but the complete kit also includes the rear tubes.
Please let me know if there are other questions I can answer.
Thanks
Mike
