VTEC/Fuel Controller or controller chip, whatever it's called... What's a good brand to get?

...and this is what you plug into the computer, under the dash, correct?

 

are you talking about a vafc(vtec air fuel controller)
and you will have to buy a jumper harness for it unless you wanna cut and splice alot of wires....

 

I was told, what I'm looking for/talking about, allows you to change the way your car runs. Such as, you can tune it for drag racing, towing, fuel economy, etc.

 

you got to know how to mess with it tho. if you don't you can make your car run to lean or to rich both very bad for an engine. i wouldn't recommend it unless you have experience in tuning. or go ahead if you have money to dump for another engine. and its called vafc (vtec air fuel controller) almost forgot. youll need a dyno. pretty expensive stuff. google this (vafc is it safe?) or (vafc is safe) and read forums on there youll see that its not easy trying to tune without dyno