According to saleen mine is 1 3/8" diameter or 34mm, and for comparison, the stock 94 bar is 30mm and is around 60%+ softer than the tublar Saleen bar. The 94 Cobra bar is actually 25mm and weaker than the GT bar. Not sure which company makes a blue one, can you take a picture of it?
Ok, installed the bar yesterday, and holy mother of jasephine, that thing is amazing! Before I could do 10 above the suggested posted speed for turns, now I can do nearly double that limit. I took a 25 mph off ramp at 45 yesterday, and I wasn't even pushing it. Its a whole new car and well worth the extra few pounds and the $75 I spent. I highly recommend to all of you that you get one if the opportunity arises. It is definetly worth it.