Dynamite's T-Maxx .21 Conversion Kit contains everything you need to strengthen your T-Maxx, allowing a more powerful .21-.26 engine. The hard-anodized chassis and components are rugged enough to deflect dents and scratches, while the longer wheelbase stablizes the T-Maxx at high speeds. The heavy-duty metal driveshafts and CV joints substantially strengthen the drivetrain to withstand the increased horsepower. the polished aluminum in-line exhaust system increases the engine's performance, as the high-volume air filter thoroughly cleans the air to the carburetor without starving the engine. The kit also includes detailed step-by-step instructions for a quick and easy conversion in just a few hours. There's nothing else to buy. The Conversion Kit comes in four versions: one each for the T-Maxx and T-Maxx 2.5 with and without a powerful Dynamite Mach .26 pull-start engine. The precisely machined Mach 26 requires no starter box and offers perfomance features like a precut driveshaft, long-lasting ABC piston/sleeve assemblies, slide carburetor and large powder-coated heatsink head.