Bought an SCT device from another company and not happy with the results? 

JMS can create 3 custom tunes specifically for your vehicle!  After ordering, your programs are sent via email.

Ford custom tuning -> (1988 - 2011) Every Ford vehicle supported

GM custom tuning -> (1998 - 2011)  Supported engines 4.8L, 5.3L, 6.0L, 6.2L, 8.1L, 6.6L, LS7, LS9, LS2, LS3, LS6

All custom tunes are created based on our extensive experience on our THREE in-house chassis dyno's.

JMS custom tunes are the best possible tunes available for your vehicle, period.

We are SCT's oldest and most trusted dealer with over 45 combined years of tuning experience. JMS has been in business since 1993 and we have tuned over 20,000 vehicles (yes, you read that correctly).  We operate out of a real building and are not your typical fly-by night internet "car tooner". 

Once your order is placed, a JMS representative will contact you via telephone to discuss your custom tune(s).  Or call 601-766-9424.