the 178 crank pulley and the 65mm s/c pulley are very safe to run. You will not lien out running these pulleys. The advantage although little goes to the crank pulley as far as HP gains. But, the risk is greater unless you buy a PSK.... If you want to keep your car stock, and just enjoy a little more out of it, just get a sprint booster to get rid of the lag in the throttle and a needswings cai. The cold air intake is a great improvement over stock, and really doesn't hurt a thing. Adding a pulley and a tune really only nets you about a half second more in the quarter mile. Unless you are competing, you will never know the difference. My wife feels I have ruined the roadster because it not fun for her to drive anymore. I can understand her feelings. Both cars are very touchy until you get used to them, but that is what I like. Not so much for her. My sons love it. But I could see where it would get old if a daily driver. Just so many accidental tire spinning starts a guy can take...lol.