THE GOLD STANDARD OF PERFORMANCE.
XMS Upgrade

XMS Upgrade

PN: 309-UXM
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.*
 
ThunderMaxis an industry award winning, performance ECM designed specifically for EFI equipped Harley Davidson® motorcycles. The ThunderMax Exhaust Matched Series (XMS) was developed for Touring models with basic, "stage-1" upgrades including a hi-flow air cleaner and an exhaust system. The ThunderMax XMS ECM comes 100% assembled and ready to install with pre-loaded matched "tunes" for your exhaust system.
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.

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