The 3 best shocks for your Silverado are Bilstein 1) Bilstein (24-186742) 5100 Series Front Shock Absorbe 2) 5100 Monotube Gas Shocks Set, 3) Bilstein 5100 Front 2-2.5", Rear 0-1" Lift Shocks Kit
According to Kenneth Taylor, the 3 best cold air intakes for your chevy Silverado are the K&N Cold Air Intake Kit 77-3082KP, the K&N Cold Air Intake Kit 63-3082 and the K&N Cold Air Intake Kit 57-3058.
The C-rating on batteries is the measure of the rate at with the battery discharges. A discharge rate of 1C will provide the rated capacity of the battery in approximately 1 hour.