I've been around pretty much every kind of racing there is and nothing is as loud or as angry as a nitro car with a blower. The experience of being around one of these cars is something that is very hard to describe.
I got to shoot one on the starting line at Indy while they were testing before the NMCA finals and it was one of the coolest things ever. I was ready for the noise, but not the sheer blast of the thing launching, totally unreal.
The cackle sounds like something from another planet, the fumes make your eyes water, and the thumping hits your chest like a hammer.
Make sure to check out around the 3:50 mark when they are burping the throttle to seat the clutch, its pretty bad ass .