Stock 318 exhaust reccomendations

For a stock 318 you don't need much, the stock single exhaust sounds pretty lame. Just run a dual system with a set of turbo mufflers or glasspacks. I run my stock-ish 318 with headers, a dual x pipe set up and glasspacks, I think it sounds good.

You could just get a Summit set up like this http://www.summitracing.com/parts/sum-680144/overview/year/1971/make/dodge/model/dart. Heck its even on sale right now. Just have the local exhaust shop bend up a set of downpipes for the stock manifolds. Or go big and buy a set of headers to go with the exhaust.