Can't whack the sound of a true vintage racer like the Napier Railton.
Even better is the unsilenced version, the Bentley-Napier.
I can't find a vid or sound clip so you'll have to imagine the wonderful noise, smoke & flame - not to mention the smell. 8-)
PS. I'll try to take a video clip at the 2007 Dunsfold Wings & Wheels event in August.
hopefully i'll be at this event too, its the one of the events that i'm going to make it to this year,
will be trying to persuade a friend to bring his very rare 125 down to the event aswell (matchless 125 of which he owns two that are in full riding condition) although he'll be in the car and i'll hopefully be on my bike.
might even try and convince a friend of mine to fly down there for the day and fly back :)