Hi Toodskie
I had a cat back Arqray exhaust fitted to my 2010 R36 wagon and also purchased it from Wal back in 2010 when our car was around 3 months old, I sold the car earlier this year with it still fitted and was very happy with it for the nearly 4 years it was on the car.
The car had a much nicer "deep rumble" (the sound first start up in the morning was fantastic) and I didn't experience any drone (witch I was also concerned about when putting on my new car)
I didn't notice any power loss (sorry no data on this) and that's the first of heard of it to be honest, IMO you can go wrong with one of these system's they are beautifully made, fitted straight on with no mods required, Wal was also good to deal with at the time with it being shipped direct to my door
I no longer have the car, but I do miss the sound
hope that helps 4paw
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