I was also thinking of getting some, but i've heard that they don't work well if you race you car. From what i heard they don't hold up from the stress put on them form launching. but i have not real idea so dose anyone here know? Alos i'm going to ask some of the ppl here in town that have them about that "cold leak" that was talked about, cause that would suck if you were going over bumps or somthing and the thinkg just slammed on ya. ouch!!