This Z28 isn't stock! I have made many upgrades & replaced old parts with new parts & have mechanic work orders & parts receipts showing what has been done. When I had it tuned by Ed Wright he said that he thought it was pushing over 325hp but I haven't had it dynoed. The mods & replacements I have made are as follows: E3 spark plugs, MSD 8.5mm plug wires, MSD ignition coil, MSD optispark, MSD 6AL digital, AC Delco water pump, BBK underdrive pulley, BBK 58mm throttle body tuned to compensate for greater air intake, K&N cold air intake, LT1 inlet elbow, alternator, Optima battery, Texas Speed & Performance 1 3/4 longtube headers, off road Y pipe, Borla catback exhaust minus the catalytic converters, removed the EGR & AIR equipment, 4L60E racing transmission rated upto 650hp, stage 2 shift kit, gold plated flywheel, 2500 torque converter, premium sound system, custom rims, brake pads, rotors, & caliper covers. All parts & upgrades are less than a yr old & I have more pics if interested.