Rustrat: As far as the size yes but again there are many factors like having a resonator(typically a must have for n/a or supercharger if you want to keep the decibels down) or not, muffler type/size and even exhaust tips when you are talking about sound/tone.

Again definitely not claiming to be an expert, just passing on what i have read/learned over the years. I was reading a article the other day that REALLY went into depth about exhaust systems, i think it was in super chevy or hot rod...can't recall but it was online.