I very much appreciate your replies. I had a test drive in a Plus 4 with a standard pipe and it did sound good. The AR 'Sports' system seemed to be an expensive option on the car, but come as standard with the 110 Anniversary no cost option package.

I'm not sure if the system is Stainless or offers other benefits over the standard pipe.

These option boxes can get very tempting and expensive so it's always good to get the opinions of those that have tried and tested the equipment so thanks again for your comments.