The local O'reiley's that I went to to purchase a cap, looked up the stock cap for a Nissan 300Z, and found that that car also requires a 1.1 bar cap, being its a higher performing vehicle. I'm figuring it will fit, but I haven't swapped it out yet. It's winter and the tiger is in the basement, so that's all I know. The tiger cross reference list on tiger triple alluded to all Nissan radiator caps being a fit for the tiger. I just wanted to make sure I got the 1.1 bar. I don't know if'n it's the pressure difference between the 13 psi and 16 psi caps that have been causing the problems.