based on that i would go with dual 2.25" pipes. you could go as big as dual 2.5" but not any bigger than that.
if you want to keep it quiet without getting restrictive mufflers, look at the edelbrock rpm mufflers. a lot of flow with less noise. other more economical options are turbo style mufflers, summit racing has some that are pretty cheap.
so i would suggest dual 2.25" with a crossover pipe (would add some power, and cut the sound down some also) and edelbrock rpm mufflers.
