I have an '81 Cutlass Supreme "hand me down." 3.8 liter 2 bbl 6 cylinder. Specs say its rated at 110 hp at about 5,000 rpm. That sucks in a car this size. I have some ideas: Swap intake manifold with larger Olds 6 cyl engine and put in a 4 bbl along with installation of headers. I don't know if anyone has had any success with improved horsepower by installing headers. Bypassing smog control equipment is a little beyond me.....could use a little guidance.