Fastlane Machine Inc. Fastlane will service your needs for. - Engine Dyno - Head Porting - Manifold Porting - Custom Fabrication - ATV 4 Stroke Porting. New diff cases and bearings add up over time and I decided I would go all aluminum with a larger bearing a la the Fastlane Machine kit. Shop in FAST LANE MACHINE from MEGA-RC LLC. Find more of what you love on eBay stores!.