When I was young and poor, my 80 volare ex cop car, 318 with single exhaust needed a muffler. I straight piped it but left the cat converter in. It sounded great and was not too noisy.
That is how I have always driven my 318s. Idk if its cause 318s are low compression or what but they are not that loud. My buddy straight piped his new Silverado (04) and it was unbearably loud.
