well the prelude will be in my possession within a week, and im looking for a little more power with a little more noise.

can this be achieved better with a custom air intake or a custom exhaust?
im not sure what the difference in price is so im looking for a little comparison

also, what effect do these intake/exhaust changes have on my fuel economy? i want to maintain good gas mileage as much as possible

thanks in advance for cluing me in