There's another forum post going on right now that is talking about the same thing. IMO this seems to be ocurring more and more and everytime I read about it, it's on the passenger side of the car. A buddy of mine at Camaro Fest snapped his on the passenger side as well and had to limp off the track. Luckily he was able to get a new pair there from Janetty and the Lingenfelter race crew installed them for him. Thing is, my buddy had no mods done except a cold air intake, no tune or anything. Here's the other thread.
http://www.camaro5.com/forums/showthread.php?t=88829