hum... have you checked davenport racing? I think they sell some rally cats, but I don't knoe about the legal-ness issue. I'll dig up some info right now...
-Team Duratec #122 SoCal #0
278whp & 259 ft/lb @ 2688rpm of Pure N/A baby!!!
7.22 @ 89 mph 1/8 mile
10.68 @ 127 mph 1/4 mile
I'm a time taker and I just wasted your time