After researching on ways to help my car out, I came across lightweight crank pulleys and love the idea, faster revs and all. After hearing many issues with other pulleys (CEL's for misfires), Grimmspeed was the best one of the bunch. It is heavier than all the other lightweight crank pulleys but still a lot lighter than the OEM pulley (being 3.5lbs lighter than OEM). I felt the smoother and slightly quicker revs, though it is a little difficult to notice. The response from the car is a lot better for sure and the minor clunking into gear I have is completely gone. It is a good mod for sure! Thank you Ben for always installing my stuff for me. Install overall is not bad when you have the tool to go with this.