I've changed the standard pedels in the past. Used the Sparco aluminium pedals with the rubber inserts. They felt good, even with wet feet, and look the part too.
To fit, you needed to remove the existing rubber covers and drill a couple of holes in each pedal to bolt them on. I've been after another set for a while and you used to be able to buy them from Halfords for £25, but either they don't stock them anymore or they are no longer being made.
Yup the ralliart pedals do fit over the existing ones and imho look ****, even thought I have them fitted to my E6, just looks like someone has stuck so semi-ok pedals on top of standard rubber ones, very crap