Here's a full Belanger set up -- no cats. I believe Nadine's is similar, or was at one time, but she has the lumpy cam for a little added effect. This takes place over a 1/4 mile or so of a closed course so to speak. 0-100+.
Recorded with a Palm Pilot almost 3 years ago pre Roe blower. It will be even a little louder now with the roller rockers just installed last week.
More air in--more air out = more concussion.
Belanger
Steve