uclaccord: H22 Swap: around $2500 done yourself.....I/H/E (assuming the components MOST people buy - ie: not cheap):

AEM Intake: $120+
DC Header: $330
Greddy/anynamebrand Exhaust: $300-500
*misc bolt ons*: depends, anywhere from $100-400

Net Gain: on a good day, and the right motor around 10hp.
$2500 H22A swap -> 50-75hp gain. *hrmmm*

So, when you add that up, you're almost half way to a swap anyway? Now, if you do it with generic parts, I could see it being a little harder to see what I'm getting at. ...not trying to argue, I'm just saying? I guess I'm crazy :P

- Nathan