I had a prelude with a ton of mods and I was running a Jacobs I.C.E and it made a little difference, but eventually I went back to stock and I didn't notice much of a difference. The aftermarket ignition wore out my spark plugs a lot faster too. If you are totally stock and want power there are a lot of other things you should do first. I wouldn't even mess with an iginition now unless I was running nitrous or forced induction