I have the Blue Flame titanium Twin Port on my '01.The standard exhaust weioghs about 18lbs,the Blue Flame about 6lb.The bike feels much better balanced with the loss of all that one sided weight.It's road legal,makes an orgasmic sound,not obtrusive.When I bought the bike the front coupling was loose.Took it up to Blue Flame(Skelmersdale,Lancs),returned an hour later,it was repaired and strengthened.Top,friendly service(ask for Dave,top man). The power delivery with map2 is very strong with no flat spots(not like my Bmw R1100RT /Remus combo) ,flat spots everywhere.Regards AL