Thanks, Fantino. Those sound files were made with a digital Nikon camera. You should hear them in real life. Ten feet behind the pipes, the power pulses at lite throttle will blow your hair, but they sound really civil at idle!
I believe Swarbrick makes a set of curved megs for the 500/550 but many of the guys seem to have difficulty fitting the Swarbrick CR750 pipes; not sure about the 550. Maybe someone else who has experience with this set can chime in.
I've had a NOS set of Swarbrick CR750 exhaust sitting in a box for years. Still haven't gotten around to spending the money it seems to cost to fit them properly. Locally, Rob North has done them, but it seems that he's booked for the next three years. And although I'd be really chuffed to have anything from Rob North, I'm afraid his price would be pretty dear even if he would do them. {sigh..} RR