i have headers on my 318. they made a difference, cant tell you how much. my cheap-*** long tube headers, dont scrape, i have 4 inches from the bottom tube to the ground. they dont leak, they dont burn wires, the paint still looks great . i have no problem changing plugs. they get a bad rap because people go blasting into driveways and ditches with bad shocks and bash them in. i have slant torsion bars and in two years they look as good as they day i put them on.