ThunderMax XMS UPGRADE KIT.
Take your ThunderMax XMS to the next level, with Wide Band Auto Tuning.
The ThunderMax Upgrade kit comes with wide band O2 sensros and harness. The kit also includes an email link that will unleash your XMS from Narrow Band Tuning to Wide Band.
*Must already have ThunderMax XMS ECM installed.*
This product is intended for "RACE READY" vehicles only and is not for sale or use on vehicles otherwise subject to emission control requirements. In the state of California, this product should not be used on any vehicle that is registered for use on public roads. Please view the ThunderMax 50 application guide for "STREET APPROVED" & ARB compliant products.