there is a little more engine noise but it is just the butter flies opening up to get that AIR that the stock air box starves it from. Have alot more torqe and power through out the power band.. and I Did Not Have the FI Upgrade works with out it...
8-29-08 installed... loud 1-3 but tolerable (loud pipes save lives) 5 gear sound great... alittle higher pitched but mellos out alot and will continue to. Great addition...