Chevrolet Forum - Chevy Enthusiasts Forums - 05 Colorado Performance Upgrades

I have a 2005 Colorado with 120,000 miles on the stock 4cylinder engine. I've done all theroutine maintenance on the truck myself, now use "high mileage oil"every oil change and at 100,000 followed owner’s manual recommendations for theservice required. Truck runs great but I’vebeen thinking about adding some performance upgrades to increase performanceand horsepower.I've read that new plugwires, cold air intake and throttle body spacer can add HP and improve fueleconomy.Any truth? Any other or betteroptions for a 10+ year old daily driver?
John