305

I got a 86 silverado with a LG4 305 in it. what muffler do people recommend for this engine. Its not a hi po engine and it dont have a cam, so i need to find a muffler that will not make it sound crappy. im thinkin of a flowmaster hushpower II but my machanic said to go with a 40 series. its got a dynomax super turbo on it now, but i want something louder.