Generic Flat 4 engineThe Generic flat 4 engine is perfect for custom builds. This design is similar to our Sand Scorcher engine and can use all the same exhaust styles. NOTE: this engine will not fit the Tamiya Sand Scorcher or Rough Rider. It differs as it is a complete engine with no cut outs. The engine includes a mount point to help install on custom projects. To install the Twin Cannon Exhaust you will need to trim the top exhaust outlets on the engine.