I don't remember the original intercom we were using in the Corsa last year, but we tried the Revolution Marine intercom system with the throat mic and were sold.
Of all the years racing everything from Factory 1, A, P-4, and Open cockpit Super V, The Revolution Marine setup was the best of all.
Check em out at www.revolutionmarine.com

How's the stereo quality in the headsets? I understand the the RMs are not true stereo, how about the others?