[SLOW 97]

I'm not too sure on your cruising speed with the 4.56's but I would have to guess it'd be about 3000 RPM. It depends on how much highway driving you do. Around town the 4.56's or 4.30's would be great. But again, the Cobra is made to run in high RPM ranges (7000 RPM Red Line!). Also, your gas mileage probably won't suffer as much as you might think. If you do a lot of highway driving go with something less steep like 3.73's. Talk to the other guy's that have Cobra's, see what they say.