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You can't gear them to reduce top speed without reducing fuel economy. If you take any given engine, and gear it so that the final gear won't send the car above the speed limit at maximum RPM, you'd be in a situation where, to run at highway speed limit, you'd be running the engine at near max RPM. This is extremely bad for fuel economy, not to mention it increases wear on the components.

DING DING DING - you win the cookie :-)

I just added a K&N Cold Air Intake to my O7 Mustang. The first thing the hand-wringers and envirowhiners will see is that I added 18-24 HP to my already "TOO POWERFUL" engine. But they will cover thier ears when I mention that my hwy mileage went from 24.8 MPG to 28.6 MPG.

They can't seem to understand that with a mid to high performance engine - more power = BETTER GAS MILEAGE

Although I have to admit the much improved throttle response, accelleration suction sound and the new deeper growl have thier attraction too ;-)

"...Although I have to admit the much improved throttle response, accelleration suction sound and the new deeper growl have their attraction too ;-)..."

Yeah ... I hear ya. Ain't it great? ................ FRegards

You really think you got that much extra power from a K&N intake? I have no idea how the mustangs respond to it. I have just the K&N filter for my GMC truck and I get a bit better throttle response, maybe a hair better milage if that. I’m looking at getting a Volant air intake after my PCM tune. They dyno’d them and got a modest gain of a few HP in the trucks.