Stage 4 is where your Spark stops being just a fun ski and becomes a serious performance machine. This kit is built for riders who want the lot: maximum acceleration, top-end speed, razor-sharp handling, and a more aggressive sound that turns heads on and off the water.
Whether you’re lining up for a race, chasing the fastest ski on your local stretch, or simply want to squeeze every drop of potential out of your Spark, Stage 4 delivers it all.
Stage 4 takes everything from Stages 1, 2, and 3, then adds the upgrades that unlock the Spark’s full character. A high-flow performance exhaust lets you choose your style (free flow, rear exit, or dual rear exit) giving your ski the growl and flow it deserves. The WR04026 air filter kit delivers a massive increase in airflow, letting the engine breathe harder and respond faster.
Combined with the ECU tune, impeller, handling upgrades, and pump efficiency refinements from the earlier stages, the result is explosive acceleration, relentless pull through the rev range, tighter grip in corners, and a ski that feels every bit as aggressive as it looks.
Each level adds performance and control. Pick the kit that fits your needs and budget.
Improved throttle response
Excellent hookup
A great starting point
Stronger pump reliability
Enhanced cornering
Builds upon stage 1
Huge thrust increase
Race tuned response
Builds upon stage 2
Ultimate top end speed
Aggressive sound and feel
The final stage
Tap to view details.
Please click here to find the instructions for all items in this kit.
