AFC, EVC, TT, what's the diff?
 

ok. I was looking on rmrproducts.com, and they have an HKS turbo timer, and an HKS electronic valve controller. The turbo timer is only $105 and the electronic valve controller is $580. Why is it so much more? does is do everything the turbo timer does plus some, or what is the deal?

HKS turbo timer is a device that allow you to preset a time to shut off your car.

HKS EVC is a electronic boost controller device that allow you to set your turbo boost. It does not have turbo timer function.

AFC is a air to fuel controler... it controls the air to fuel ratio mixture... again different from the other two