Not really that I can say. The targa top on a C4 is a structural part of the chassis. It is suggested you don’t drive it aggressively without the top on because the chassis will flex. This tubular structure, replaces the targa top and retains the structural integrity for aggressive, driving or track use. I’ve never driven the car without the top on so I can’t say on the difference.That's pretty cool, never seen anything like that. It make a difference you can feel?
