within the first 4 months of me buying my 12 cbr brand new, i bought a leo vince corsa exhaust. WAY too loud, especially at highway speeds. as others on this thread, i bought it for cosmetics and weight savings, and wanted a bit more noise (not deafening) but if i knew what i was in for, i would've saved my money. thankfully i didnt spend too much. now i plan on cracking open the leo vince and gonna try to quiet it down to get a good happy medium between the stock exhaust and the leo vince exhaust.