My buddy has an 05 1KRR outlaw dragbike. He experimented with gutting the airbox. It took forever to get enough fuel to motor afterwards. We had it on dyno hooked to his laptop. He added and added and added til A/F ratio was fairly close. HP numbers were about even with bone stock RR with stock exhaust. Honda spent alot of money designing that intake and doubtful there's any hidden power in there waiting to be discovered. But, it's alot of fun trying so go for it! Like you said, buy a used one on ebay and see how it goes.