APR's Stage III+ Turbocharger System is available as an upgrade for those who have previously purchased an APR Stage III Turbocharger System. This upgrade package includes upgraded APR Stage III+ Software, APR Stage III+ Turbocharger, APR Stage III+ Injectors and all the necessary replacement parts needed to upgrade your Stage III to Stage III+! APR's Stage III+ Turbocharger System greatly increases power levels. APR recommends replacing the factory connecting rods with high strength connecting rods. APR is not responsible for damage, which may otherwise occur.