[lateapex911]

For racing purposes, the certification allows you to install without a backrest support. In SCCA, any non certified seat must have a back support that attaches to the roll cage. Basically, the support must be through bolted to the back, to resist forward and backward or side impacts.

The rule originated when a Porsche 944 spun at Lime Rock in the rain at the end of the straight, and backed into a bridge support, which, I understand had an earthen embankement in front of it.

The impact snapped the front seat mounts, and the seat hinged backwards on the rear mounts. The driver was forced up and backwards, and sadly died due to neck injuries.

It was a PCA event, but the SCCA suggested the very next week, thru the grapevine, that all seats receive such supports. A year later it was a new GCR rule.

Some disagee, but I think such supports are a good idea regardless. The seat shown appears to be an ideal candidate as the web design of the back would be particularly ideal for a through bolted support.

IF the car will see track use, but there will be no roll bar installed, then a properly certified seat and mounting system would be a better choice.