The standard road bike makes a nice enough noise granted, especially with full Termis on. But It don't compare with full spec SBK version, especially since now they are bigger bored. Even so, I wouldn't expect just the one to be even close to a spitfire.. but a couple of rows of them launching from the starting grid at a race is an awesome noise.

You want loud? Try a Harrier jump jet hovering about 100-150 ft from the water in the middle of chatham docks, (no more than 200ft away head to jet). The sound was deafening and the ground was shaking even with all that water soaking up the thrust !!.

GTM