The SR intake and exhaust are already way better than a K&N and a fart can. Don't bother changing them. Guys over at teamzx2.com will confirm this. You will never recover the cost of the CF hood and trunk in fuel savings, so I would not throw money away on that either. Go with proven, cheap mods to get the most efficient use of your money. Empty your trunk, remove the weight from your glove box door, install a grill block, air dam, rear wheel well covers, pizza pan covers (you can probably get some cheap in your line of work
) and go easy on the right foot.