I've got a 90' Laredo. I've put a 34/34 Weber, E3 plugs, MSD Blaster SS coil, MSD Helicore wires, Nutter bypass. I've tried to lean out my carb as much as possible. I'm trying to get good mileage plus see how clean I can get the tailpipe on a carb. Next step is a metal core cat converter. They say they flow 40% better than ceramic high flow cats plus operate at higher temps to burn off more emmisions. Right now I get around 18 on the highway.