Couple "newb" questions for the guys who have done it 100 times.....

When going from carb to FI, is it easier to convert or change out the whole engine?

Lots of wiring involved?

Is MPFI harder to find, and is it significantly more efficient (fuel wise) than SPFI?

If I did change to FI, would anybody want my carb stuff?

About how much does it cost?

 

I'm just 2WD and my main concern is fuel economy, don't really care much about power since I drive like a granny anyhow.

 

Now I'll go and do what I should have already, search search search.

SPFI is plenty good for fuel economy. It's realatively easy to swap over, and it works great. The part I liked about it was how well subaru had written the limp home tables for it. As long as you had the distributor hooked up it would pretty much run. MAF unplugged, TPS unplugged, CTS unplugged, it would still run and drive. So good for reliability in my book.

 

If you're going to the trouble of MPFI, you might as well do the wiring for an EJ engine. You don't have to go with a 2.2l, there is plenty of 1.8l EJ's for cheap out there in impreza's. They're a more efficient head design than any EA head was on it's best day, so you can expect greater MPG out of one.