all...most the sponsors do good work, some a bit a more consistant than others
if you get some decent porting its advisable you replace (with a Hot Rods) or rebuild your stock crank or it will come apart in time...once you go beyond bolt on mods its a real gamble
a lot of peeps roll with a duneport for open trails, if youre hardly using 1st to 3rd it would most likely suit you too