Yeah, ridenour's right on the fixing a flat price. I'm gonna say this though, you probably bought z rated tires for a reason: to drive fast once in a while. As far as I'm concerned for your safety and the safety of others on the road, that tire is done for. If the the tire was just being to putt around on at normal speeds then sure have it patched, but if your going to speed in it, in my opinion I wouldn't suggest fixing it. Again this is just my opinion.
Marc