sorry buddy, but nitrous oxide has been used since the 60's and there is no intake in the world which will give a civic 10% more power. the 10% is a marketing claim, which means the K&N guys got 10% more power on ONE of the cars they did the installatino on and i can assure you the car had a turbo and a very restrictive OEM airbox (like the early lancia deltas). BTW in the old days people got more power out of their engines by playing with the heads, giving 3-5 angle grinds to their valves, fitting ultra high compression heads (like in the hemi) and lightening the weight as well as fitting larger carbs, higher ratio rockers and cams with more aggressive profiles. reason i know this is becasue this is exactly what people STILL do with VW's.
as far as the power claims go, even on the Z06 (factory 505hp) the power gain was 27hp which is around 6%. now do the math, the car had a high perfromance 7.0L engine,.. now do you honestly expect a 1.8L Vtec engine which is designed for economy to produce 10% more power?
i'm going to have to disagree with you on this one.