an aquaintance of mine, steve @ FUELATV.com in cali is doing major r&d on the ltr's and what he's got back from the dyno is this= 1=48 h.p. w/cherry bomb,no lid,no spark arrestor,91 pump fuel.
2=51 h.p. w/cherry bomb,no lid,full DASA exhaust system,91 pump fuel.
3=55 h.p. w/same set-up as #2 + mild cams & mild port & polish.
that is gospel