As the previous poster noted, I changed to a Corsa Track exhaust, keeps the stock cats with no major changes except getting rid of the exhaust criss-crossing under the cockpit. I got some nice exhaust tone, a few ponies, & the cockpit is way cooler - to the point I felt no need to try anything further for cooling.
There are some insulation kits out there by vendors on this site which are reportedly very effective. I was going to get one, but the exhaust change was enough for me.