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^ you might have an oil leak then. Does your car have an oil pressure gauge? if so, you might wanna look at it. If the pressure is in the lower half after driving it warm, you've got a leak somewhere. It might be at the valve cover, cause those gaskets only last so many thousand miles. Also, if you have an oil filter elbow, the o-rings can get hard and crusty and then you leak from there. I know honda's usually use a lighter weight oil. Something like 5w-20 or something? (might be the newer models though. Yours is a 96')
What RPM's are you running at the speed you usually cruise at? cause backpressure can be good if your car is geared really low (taller final drive). Back pressure increases low end torque, but chokes the car at high-rpms. While low back pressure has little low end, but the higher rpm's thrive. Normally hypermilers like to keep a slower speed and lower rpm at cruising speed, so back pressure is beneficial, while racers like large or no exhausts because they're almost never in the low-rpm's range. they're always up near redline, shift, redline. etc.
A 3" exhaust might be too big if you decide to slow down, especially from the smaller motor. You might want to downsize to a 2.5" exhaust if you can.
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