Serpent SER903776 S989 Flex Insert Kit (2 Pieces)  [SER903776]

Precision Flex Inserts for the Viper S989

The Serpent SER903776 Flex Insert is crafted to match the Viper S989 GP chassis and provide controlled flex where it counts. Properly seated in the S989 chassis, these inserts help steady the car and reduce unsettled behaviour through complex sections.

Better Balance Through Corners

Adding or changing these inserts alters how the chassis twists under corner loads, giving you a practical method to tune rotation and stability. Small adjustments can improve confidence on entry and mid corner phases without major setup overhauls.

Fast Fit, Easy Reversion

Installation is straightforward and does not require chassis modification; insert into the dedicated slots on the S989 and test. If the change is not right, the inserts can be removed or swapped quickly between sessions.