Those looking for the next step up in speed, might consider moving to a GT-1, GTA type Road Race stock car.
Much more affordable than you might think. For example, you can purchase an ex ASA perimeter frame
stock car (easily converted to road race config.) complete with race prepped LS-1 chevy and Jerico trans for 13,000-20000 dollars. New Goodyear short track tires are about 100 bucks, suspension pieces are massed produced and relatively cheap. Other perimeter frame cars with 500-600 hp are similarly available.
These cars are easy to work on, very strong and offer 180 mph capability.

The V8 Stockcar series which runs in conjuntion with CFR SCCA and other regions offer big fields and great fun at the best tracks in the country. Look at the numbers in the GT Field of late in CFR.

For more information about running these type of beasts, check out V8 stockcar.com

"Bosco" Logsdon