Yea i dont do much racing myself anymore either, which is one of the reasons i've been driving new cars heh. Irwindale is a cool little track, one of the few strips we have left around here ... and they've been talking about closing the place down for a while now.
Thursday night Thunder is what i usually pop up at but they hold a bunch of other little events there. Like drifts, destruction/demolition derby's, etc lol.
These cars can not only tear up the straight line, but they also dominate on the track. The Z06 has actually put up some super impressive numbers and even cracked the Nurburgring top 10 last year ... which the new ZL1 Camaro also did, can you believe the Camaro is putting up super car numbers now?
But the Z06 uses the same spoiler. I think you're referring to the new 755HP ZR-1's. Which is the most track ready/capable Corvette(or any other American car in production) ever built form the factory.