Wait, they don't?! ;D

 

They are a ripoff. You've been warned by everyone here. Follow the consensus.

 

I love that comment chibi, and love even more guys with hondas at the racetrack that add up the "rated hp gains" of all the things they have put on their 126 "crank HP" engine and say they have a 240 horsepower engine. Yea and maybe 85 hp to the wheels!!! LMFAO

My best friend has a 2000 prelude 5spd that is rated for 200hp stock and has a cai on it and my monte spanks his car.

Sorry for getting a little off topic.

Now in a reply to the black box performance thing, my hypertech programmer gave me a 1-2 litre/100 km gain in mileage on the regular octane setting and a 1 litre/100 km on premium octane settings and i use 94 octane from sunoco. That was without the cai with it add 1 litre/100 kms to both.
I tried it without the K&N cai, and with it on both settings and just stock with different fuels. I tried it all out about 5 days after I did wires, plugs, pcv, oil change, and new tires. Last fall when the temp was about the same outside for about all of october.

So if you want gas savings buy the cai and a hypertech programmer. It makes the car a little bit faster also.

 

x2- I think its called the placebo effect? That's why when they test the effects of new medicine, they give some people the real thing, and some basically inert pills.