Ya, I have heard the Saturns like it. Im thinking of just cutting a few holes in the duct that goes over the rad infront of the exoust. Figure that will pick up warm air.
That will work a little. I had a SC-2 that had a high of 42MPG (mine was a 5 speed). What I did was cut that tube going over the radiator and using flex tubing extended it to the header (I replaced the exhaust manifold with the tube header from a '92).
If I remember correctly, yours has the open grill front bumper. Blocking that will help on the highway.
I disagree that your cutting holes in the resonator will help. Sure your intake temps will rise 10-20*F, but that's not enough to see any significant MPG increase tank-to-tank.
Engineer it any way you want, but you want a real HAI for a Saturn... mine went from 33mpg highway max to 46mpg highway. Never used P&G or EOC. Just mild drafting and no cruise control, HAI and SG-II. You want the SG viewing *f IA to monitor your HAI temps, I've seen that above 150*F is best, keeping it between 170-180 is amazing for MPG but the car will feel sluggish. I got an additional IAT sensor from a junkyard and just cut/solder in the new one to help extend the wires, then drill/tap the TOP of the air cleaner box so your sensor will read actual temp entering your engine, rather than reading under the filter where you'll be getting a mix of fresh and warm air.
Also, if you've owned your Saturn long, you probably know about the ECTS, Engine Coolant Temperature Sensor. The stock ones are made from some type of plastic, they're garbage; inaccurate and WILL fail and leak everywhere eventually. Get a brass tipped one and you'll be good to go.