Might check your tie-rod ends as well.. Just to be sure.
*On a side note, send any deer meat up here to me. My goofy state doesn't really like guns and, as a result, has put a damper on my protein :(
Obviously if you're pulling more boost you're going to pull more numbers. Nothing heart stopping, but you will see an increase. On colder days, you can expect to see a few pounds more of boost but nothing exceptional.
My truck would run alongside or ahead of the Z06's all day long (KB days). I wouldn't even bother with them while driving the Saleen, however. I'd rather them just think she's too fast for any Cheby product :D