Personally, I think some of the higher powered cars would likely work better with a full cage and some well placed tubing. But maybe they have tried and that isn't the case.............or maybe they just don't want to ruin the LOOK. Who knows, but if I was building one it would have a cage. You can never completely hide one and the a-pillar bars are the easiest to see. Now with a LOT of work you could sink most of the a-pillar bars into the actual pillar, but you would have to cut the car up and I doubt they want to do that either.