Most sanctioning bodies require a -15 suit if you run unblown and an open cockpit. Or if there is no firewall to separate you from the transmission. If plans are in the works to later put a puffer on the car, then the idea of buying a -20 suit, required by the sanctioning bodies and good sense, is a great idea. Something you might want to consider is just how hot your body can get in a fire suit, especially in your part of the country. After listening to Dave tell everyone here that Biondo had good prices and great products with their Sparco suits, I bought a Sparco AIR-15 two piece suit and couldn't be happier with it. While a little more expensive then some, it fits well and while my previous -15 suit felt like I was wrapped in 2 wool blankets then stuffed inside a wool sleeping bag, this new suit only feels like the wool sleeping bag without the blankets and that's a HUGE improvement:)