Finished with cosmetics and am now moving on to performance upgrades. I have my mind set on an Apexi World Sport 2 catback and some U.S.-style Type R headers. I'm looking for something that will give me an immediate horsepower increase but is still large enough to be effective after I've put a little bit of work in under the hood. I'd like to only have to buy this once. My goal is about 220whp N/A. My friend recommended 2¼ inch. He said any bigger would wear on my wires and plugs. Would that 2¼ inch get in the way later on? Or would it still be helpful after mid-level mods? Thanks.