B&M Hi Tek Aluminum Differential Cover for GM Silverado Sierra 1500 Black 71506 in cabin monitors Uses Holley water meth solenoids specially 49449 FBHB Uses Holley water meth solenoids specially designed and calibrated for use with this EFI system to allow the user to enter water meth flow as a percentage of fuel injector flow for water meth tuning precision unmatched in the industry Designed to custom fit all LS Ignition coil models Additional Fluid Capacity (qts) Yes Bolt Count 12 Bolt Studs Included Yes Brand B&M California Proposition 65 Chemical Name Chromium (hexavalent compounds) California Proposition 65 Required Yes Call Out Size (in) 3 MIL Spec (MIL A 8625) black anodized finish