well i like my triad inspired exhaust i made for less than $75. if it is anything like triads for loss of hp, which it should be since he told me how to make it (
triad dave ) i will have only lost about 6 hp, out 175 or so. and it sounds sweet and type 4 ish, even though its a suby.
but i almost went with the summit muffs with disks, but i wanted the balance between the cylinder banks