Z51 Performance Package includes (J55) performance brakes (J6A) Black - painted calipers slotted brake rotors (Z52) dry sump oil system (FE3) Z51 performance suspension specific shocks springs and stabilizer bars (XFJ) P245 / 35ZR19 front and P285 / 30ZR20 rear tires (Q7S) Silver - painted aluminum 19» front and 20» rear wheels performance gear ratios (G96) Electronic Limited Slip Differential (eLSD)(KNR) rear differential cooler transmission cooling and an Aero Package (highlineautosales.com)
The Z51 Performance Package includes the larger 19 - inch front and 20 - inch rear wheels and tires; larger slotted rotors and brake - cooling ducts; Performance Traction Management; electronic limited - slip differential and differential cooling system; unique chassis tuning; and available Magnetic Ride Control active - handling system with Performance Traction management. (corvetteblogger.com)
Aerodynamic improvements at the rear include large rear diffuser meant to increase downforce and help funnel air to the optional differential cooler. (automobilemag.com)