The stock exhaust on the SG sounds a little louder and deeper than my FB did, perhaps it's the bigger bore of the 103. I must say that so far (520 miles) I'm not really missing my FB a whole lot. The SG handles great, has decent power, looks cool, and now I can cruise with tunes playing and carry extra clothes and snacks and stuff with me. If you are a super aggressive rider then you may prefer to keep the FB. Not to say that the SG can't be ridden super agressively either. I know it is a tough decision.