unfortunately, your post isn't right. there are some things to realize. first of all, anything can be proven on a dyno that the dyno operator wants to prove. next, simply throwing parts at an engine is never the answer.
"anyone" can get up to 85 or so HP out of the 2V engine by throwing parts at it. of all the parts one does to "throw at" the package, the FCRs on the long manifolds are the most effective. this yields great throttle response and does things for the power delivery that are unbelievable until felt. these things you cannot get with the CV carbs (even with modifications).
one of my customers was able to coax 80 hp out of his almost all stock 900ss. the engine had never been opened. it has ignition mods, special tri-core mufflers, and serious carb tweaking over many dyno runs. we slapped the FCRs on his bike and the first thing he said was "why didn't you tell me to do this 2 years ago!?". well, i did. :
he said it was far more powerful and wheelied easier. first dyno run showed a 6hp loss from before. as we later figured out, his bike is something "Special" and required some tuning to get right. different slow jets and some tweaks on the mains and he's up to 82 and happier than ever.
now, on to the topic of the short intake manifolds. this makes life a little more difficult. first, you need to take sawzall tothe cross frame member in the engine bay. then you buy manifolds, rubbers, "carb kit", filter adaptors, and filters. so you're like $1400 spent. you put them on, go spend hours on the dyno... and get... 82hp.
then you put in big valves and "do port work". then you get. 85 hp.
you need to do full-on serious Guy Martin "testa-rosso" headwork. the shape of the ports is carefully changed and everything is considered in the process while only using the best parts. problem is, this package is aserious investment on top of that $1400 investment. but this is what's required to get the power.
in january, i will have pongo done and build a webpage detailing the benefits and downfalls to what i call "the arms race". there is good argument for starting with the maximum available weaponry, rather than attempt incremental approach to your development. the key issue is that the customer needs to evaulate where they want to end up in this "arms race". if they want to go all the way, then this is the package.
i'm going to call it the "weapon of mass destruction" package. it's all out warfare on the horsepower front. unfortunately, to get this power means a serious one time committment of money. but in overall terms, it's going to result in less money spent and more horsepower at the pavement than any other 2V option.