well yeah like header and cai. but the upgrade to the fuel system in it self will restore the lost hp to your engine that the factory lost in the name of economy. but also msd coil, iridium plugs, upgraded plug wires, hyper groud type hook up, optima battery, cam gears, cat back, radiator with improved cooling efficency, proper tune up and maintenance I.E clean air and oil filter. and I'm sure a few others that are standard upgrades when doing a turbo but will still help without the turbo, such as optimizing the fuel system. but yes loosing the claimed 20-30hp from cai and headers is and excellent trade off if in return you'll add at least 80hp with the ability to increase fairly simply.