MPG-Cold Air Intake, exhaust, suggestions?
 

Ok I've got this 94 626 2.0L running fairly good 153,000 miles, still dorkin with the IAC-PIA, got a digital code reader coming in the mail (thanks BH for the link) now for better gas Mileage!

First I'm going for a CAI what are you all running on a 626 2.0?

Then a better/bigger exhaust, the muffler shop in town can do a fine job(Fast Eddies)no need to spend more than 200 bucks for the down pipe back, but how big for a 2.0L- 2inch 2.25inch - 4.5inch?

Then like my other 2 vehicles goes in Mobile 1.

Saw a couple CAI on ebay but what do you do about the Mass Air Sensor and vacuum line?