After lots of deliberating i think i have decided to give my '97 328 a slightly gruffer sound. Its got a k&n which gives it a good induction roar but would like it to sound a bit deeper. Would a stainless back box do this without going overboard. I dont want it to annoy the neighbours at 4am when i go to work or irritate me on the motorway. P.s, i'm not a chav but love the sound of the straight 6 and want to hear it a bit more.