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As Step up from the Stage 1, This Kit Is Designed to Improve the Power for the GX340s and GX390s along with Improving the Durability.
Now You Are Getting Serious! A Step up from Our Stage 2 Kit, This Will Further Empower the 420, Producing up to 20+ HP.
As step up from the Stage 1, this kit is designed to improve the power for the GX340s and GX390s along with improving the durability.