I never put proper roll-over protection on mine, because it would mean cutting out parts of the the back shelf. It would also cover up the area were the top supports slide into the body. Plus , The rollbar would be too tall to use the top. Blah,Blah Blah !!!
If I really want a track car I will sell my S1 and buy a proper racecar, or a Caterham with a FIA bar or better. I think my S1 is to nice to hack up. I feel that is the one area that Superformance screwed up on the S1.
They claimed that it is a great track car( and it is) but lacking rollover protection, you don't want to stuff it, or worse, roll it.
My 2 cents, LOL