Exotek introduce two new option parts for HPI Racing’s Micro RS4 line of cars. First up is the titanium rear axle and ball diff set that is designed to replace the stock gear differential. The externally adjustable ball differential makes for smooth acceleration and swift diff action setup. The alloy left and right axle hubs are polished and anodised in factory orange for looks and durability and the gear pulley set is machined from lightweight but durable POM. Included in the set are... Click to expand...REDRC: Exotek Micro RS4 option parts Continue reading...