the most i can say is get a +4 timing plate some fmf fatty's a 13 tooth front sprocket and a 42 on the rear with some 20-10-10 razr's and you got some low end.thats the setup i have and its a LOT of low end
actually they do something usefull. instead of keeping slop in the chain from say stock rollers. it keeps the chains to where when your on pavement if you floor it it doesnt have the chain slop and grab in it onto the sprockets
um hotrods is bs'ing you there. if it says hr204 its the new version of the stock stroke. and as for the ck 158 same thing stock stroke just a older version.
imo. id buy em if i needed em.. and then keep the silencer and turn around and clean the headpipes up and polish em etc etc.. then turn around n sell them.. then buy some new dmc headpipes.. iirc the alien headpipes are the same
are you on stock airbox? i had the same problem and im at 2k feet and stock airbox and filter. with some 300's in the carbs and it bogged until i put the open airbox and solved the problem