I am going to partially disagree with you. I think CPI's with stock porting might be tough to justify. If you have a port job, with stock carbs, on a stock stroke engine, I think CPI's perform fairly well. It all depends on where you are riding though I suppose.
There porbably are better pipes out there for the this particular application, but if it's what he has, then it's what he has and we should try and help him.
Stock carbs get a bad reputation because of the TORS crap and the slide to barrel tolerances. Beyond that, the stock carbs will allow more air through than several other brands/styles of larger bore carbs. (I know some one is going to get all butt hurt if I immediately mention which larger bore carbs) :ermm: