Savage owners, if you"re running an extra strong steering servo and need a stronger servo saver spring, HPI now offers this heavy duty option part for more direct steering response. It"s a direct replacement for the stock spring, just bolt it in and you"re ready to go. Compatible with Savage Flux HP, Savage XL, Savage X 4.6, Savage X SS, Savage X and older Savage trucks.HPIPart HPI102522