Saturn is correct if you are referring to the carts. If you are referring to the actual racecars, visit
Radical Sportscars - Ten Years On - 1997-2007. They are based in the UK with a distributor as close as Jupiter, Florida. The "starter" SR3 model is powered by a Suzuki 1500cc engine that revs to over 10,000 rpm, other models include the SR5 that is powered by Honda v-tech, an SR9 full spec LMP 2 car and new this year they are offering the SR10 that is a full spec LMP1 car.
And in case you are wonder about cost, there was a used, full carbon fibre bodied SR3 car (only few exist because it is a 5-7000 dollar option) for sale at Sebring last weekend for $70,000.
That was mine, for sale on this site!
https://www.tamparacing.com/forums/c...downforce.html
As far as Radical's go, the base SR3 model comes with 1300cc motor, you can also get it in 1400 and 1500cc stroked; mine is the 1500cc, 250 HP. The Florida distributor for them is
Radical Motorsports of Florida - Home
However, that awesome pic of the yellow car in front of all the others was me starting the race in my Juno Racing SS3-V6 which is a 3 liter 390 HP V6 based loosely on a Jaguar block but dramatically different. Unfortunately I had to retire after about 25 minutes due to a wheel bearing failure but was leading much of the race at that point.