Originally Posted by splitsecond
You forgot the cat-back exhaust.
Also, you might want to consider a walnut blast. It breathed a whole new life into my engine, and I only had 37k miles on it. I've never seen a before/after dyno, but I'd be surprised if it didn't produce a noticeable difference.
Doh, how did I forget about the exhaust. I have the BMW performance one on there right now.. but meh.