Quote:

...on the intake side it will increase fuel consumtion as if it gets more air it will automatically be fed more fuel so as to maintain the optimum fuel/air mixture



But the way I was thinking it worked was that a new intake would just be less restrictive, so the engine wouldn't lose as much power having to suck the air in, not that anymore air is actually getting to the cylinder.

I would have agreed with you that increases in bhp would need more fuel, now a mate of mine has tried to explain as above and I'm just in two minds and confused!

Any automotive engineers around?!

Or anyone with any mods got some consumption figures?