like i said before, when someone else has spent the money they can tell us what they did, but seeing as only dave and rod have, as far as i am aware, there may be others, no one else can really see the story from their point of view
not to say that others haven't spent lots of money maknig engines with lots of power, i'm only refering to marks engines here
and i'm sure that chpi has had a hand in doing lots of helping out with daves engine so it's fairly easy to see why he's backing dave and daves choice of tuner