I believe you mean diameter when you say 2" or 3" inch, and the 2" will sound louder. The bigger the baffle usually sounds a bit throatier. I had 3.5 inch Rineharts with 2" baffles and they sounded good but a little ratty for me. Went to 4" Bassini's with 2.5" baffles and now have the sound I like still loud when I get on it and a nice clean throaty sound at idle and cruise.