the four to four in its day was impresssive visuallay,but we soon cottoned on it was #$%*,and heavy,not two minutes after these bikes hit the show rooms a lighter 4-1 was available,i aint seen a 4-4 system ever since?why the #$%* would you?four to one is the only way,four to two nets two frog #$%*s more power but at a heavier burdon?(debateable)so any four to one has to be better?these are old bikes now, and most of the four-fours are long gone(thank #$%*)if your running a four to one use as long muffler as your noise ego will tolerate.
