The RS4 Cab is Audi's answer to BMW's forthcoming M3 Convertible. Since RS models (and not S models) now compete directly with BMW's M models, the RS4 Cabriolet is a model that simply has to exist in terms of competition.

The RS4 Cab will have aluminum front quarter panels and hood to bring the weight down by roughly 150lbs.

The current S4 cabriolet, with a suit of very heavy safety and structural re-enforcements, weighs in over 4000 lbs. It therefore suffers greatly in terms of performance.

The RS4 Cabriolet on the other hand will weigh in at around 2800lbs, which is actually how much the S4 weighs. This lighter weight, coupled with a 420hp V8, will finally give Audi a true high performance Cabriolet.