[SuperMacGuy]

Dammit so I am trying to fix my brakes, and seriously considering the C7 z51 brake upgrade. Which according to peeps on LS1Tech seems to fit 17 inch wheels. EXCEPT I look at my CCW wheels and see there is a 1/2 inch "inset" bump on the inside of the barrel. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/rant2.gif) (IMG:http://www.frrax.com/rrforum/style_emoticons/default/banghead.gif) I went with 17s when I got them b/c they generally fit and I thought I'd be good with them. I didn't buy the new brakes yet but man I am upset. I don't want to have to sell these (along with a set of extra tires) just to buy 18s and spend even more money.

[CrashTestDummy]

+1 on Chad's reply. In an autocross situation, lightness matters, as long as it gets the job done. This has been serving us well for more than 3 years of 2-driver, once a month Regional events:

(IMG:https://media.fotki.com/2v2Uf3u3UxJDYiP.jpg)

But I'd not want to depend on them on highway or road course driving. If Chris is considering road course events, or still drives the car on the street, especially with a stock weight car, I'd not recommend those, but they ARE (without the scalloped rotors) recommended for drag race use. But if you're going to spend the money on upgrades, bigger, more mass brakes are usually a good compromise over anything different. Going lighter can compromise braking performance some.