Thoughts on
 

The Megan racing headers, why are they so cheap, are they good or what? Or should I just buy the DC 4-2-1?

I'd buy the cheapest crap you can. Breathing mods on anything with a sohc are pointless unless you plan on a cam, intake manifold, and a tune. You may get a extra 2hp with a name brand unit but w/o all the things I mentioned and even then you will do good to make 120 to 125whp.