Nope... depends on the car. On many cars, Intake and Exhaust tracts are very... errh... makitid, and they choke engine breathing. So you're using as much gas for less power.

Minor mods, intake, headers and the like, actually increase fuel efficiency by freeing up power... but it's a double-edged sword... go too big in the intake or exhaust, and your fuel-efficiency will divebomb.

AFAIK, the Mitsu air intake is just right and most new cars are like that. Basically, if your headlights start going under, your intake is still above water.

On some cars like the GA16 Sentra and the Optra , the intake is just behind or below the headlights, which means they are very vulnerable to floods. Don't ask me how I know this... I'm still traumatized by the fact...

*raon: Good luck! Sayang wala pang re-flash, but I think GM-Chevy should offer it for free to all Optra owners once they get their hands on the data.... grabe, didn't know the MT had a similar "drinking" problem to the AT... you're really lucky that it's MT...