I almost went for the Blueflame, but my backbox fell off before I ordered and I couldn't wait 2 weeks for them to make me one.
I got a S/S Powerflow stealth cat back for £230. Cheap compared to the £440 for the Renault system. Mines got lifetime guarantee, Renault has 1 yr. I've had 2 OEM ones and the S/S seemed the way to go.
But for a 2" bore 'quiet' system, I wish i'd spent a bit more and got a quieter one. Though everyone else whos heard it thinks it great. And quieter than the others???!
I must be getting old....
I'll get some sound clips up over the weekend. In for a service on Friday...day off...playtime!