I have a HKS EVC IV boost controller used for sale. still in great working condition. features dual settings (high and low), fuzzy logic, very easy to use, overboost warning setting, scramble boost, etc. you can also find some good information about it online. i bought it for 375.00, which was a very good price. i'm willing to sell it for 280.00 obo shipped anywhere in the U.S. i have sold many things here so i'm not trying to rip anyone off. i can send pictures of it installed and working on my car which is at the present moment. thanks.