Not required, but highly advisable to plant you in the seat in the turns. When driving fast on a road course, it is important to be firmly "emplanted" in the seat during high "G" maneuvers. The OEM belts don't do that well at all, so you end up sliding around in the seat and trying to control the car at the same time--not the best of situations.

And BTW, if you do go for harnesses in the future, you will need to have some way to position the shoulder harnesses correctly. Namely a seat with harness ports or some sort of arrangement that will hold the harnesses in place above your shoulders. You don't ever want to use shoulder harnesses without harness ports of some sort.

Here's an example of a home-made set of harness ports that work very well with the OEM seats, as long as they are the variety with the adjustable head rests.

 

Why get a roll bar if you are not going to have harnesses? If you are driving that aggressively that you need a roll bar, you should seriously consider getting harnesses!

 

Well if I roll over of course.. lol.. I just didnt understand why u said I needed one.
I thought you were implying tha it wouldnt work with out one or that it was some type of rule for track use. sorry I miss understood.

But after the point ha have been brought up I am considering it now. I wasnt thinking about when cornering sliding around inmy seat but now i am...

 

hey did you make those? is there anyplace that makes something like that to work with an oem seat. I really dont lke the feel of a racing seat Im a little thick and every seat ive sat in it felt like my nuts were going to burst lol..

And thanks for all your help on this subject I apprciate it

 

Yup, I made them with the help of a friend. Basically cut out of a block of wood and faced with 0.060 aluminum. In the improbable case that the wood would break in an accident, the aluminum would still hold the shoulder harnesses in place. Two holes are drilled in them vertically to mate up with the headrest posts and then the headrests are reinstalled. The arrangement has worked well in the half dozen or so HPDE events I have run since installing them.

A comment on my experience with aftermarket Corbeau seats for the FC. The seat mounting points on the passenger side floor are at different levels--the inside rail is an inch or more higher than the outside rail because it mounts on the side of the center tunnel. If you take the seat out and place it on the floor, you will see that it tilts inward quite a bit. So, when you mount an aftermarket seat on the passenger side using the adapter mounts that come with the seats, the seat sits a couple of inches higher than the OEM seat and the drivers seat as well. That's enough to make it impossible for someone, even a fairly short person, with a helmet on to fit in the seat without banging the helmet on the sunroof (of course, if you don't have a sun roof that may not be a problem). Had this experience and had to ship the seats back for a partial refund. A real hassle to say the least.

 

At very least get the diagonal brace, without it the roll bar is significantly weaker. It doesn't really limit seat travel any more than the bins do. I'm 6'3" and I don't have a problem with it limiting me at all. As for the hanress bar, it's best to get one, so that you can make use of it in the future if you want. As for the bins, just don't carry so much junk in the car, of if you wanted to get tricky, make an opening for between the seats and the bins to gain access to that area.