The BAD is over 90% myth, internet heresay, and based on problems that ricers have who have no business trying to modify a car.
The GOOD is in the dynos and is pretty obvious. Better throttle response, more HP, more TQ, great bang for buck, and even better gas mileage.
People who have done their homework properly to select a good pulley kit for their cars have been successful with kits like these since the muscle car era.
