The Injector Dynamics injectors for the SG models require either modification of the stock wiring or the use of ID's pre-fabricated adapters. The adapters cost about $45 for the set and make the injectors plug-n-play, so they should not increase the shop's labor hours, but would increase the total charge if the shop has to supply the adapters. If the shop chooses instead to modify the stock connectors it could well run about an hour of labor.