Nitro Upgrade Kit — 4400

Nitro Upgrade Kit. Traxxas makes it easy to upgrade TRX ® Pro .15 nitro-powered models to the awesome power of the new TRX 2.5 Racing Engine.

Features & Application

• All the necessary hardware to bring older Traxxas models up to full TRX 2.5 spec is included such as: header, pipe, pipe hanger, coupler, linkage, and additional components specific to each model.
• Major components come pre-assembled and pre-adjusted from the factory.
• Detailed instructions are included.
• (Engine sold separately)