Are you going to use your car as a daily diver or as a racecar? If it's a daily driver then a fixed 4 point harness is a
bad idea. These types of harnesses that have fixed anchors are intended to be used with a head and neck restraint. If one is not use then
your harness could seriously injure or kill you by causing a basilar skull fracture if you are involved in a front end collision. This is how Dale Earnhardt Sr. and many other NASCAR drivers died.
Basilar skull fracture - Wikipedia, the free encyclopedia