Okay, basically, what do they do? I mean, having a bar across your trunk etc...what good does it do?

 

it supports the points where there is flex to make your chassis more rigid

 

http://www.houseofthud.com/cartech/swaybars.htm

Google is your friend.

 

whats a good strut bar? and are ebay struts just all show?

 

https://honda-tech.com/zerothread?id=57813 – Strut and Sway Bar Discussion

If you buy like a 4 piece (top and bottom front and back) kit off ebay for cheap, im sure it would help and be worth it, but the more spendy ones help out ALOT more.

Just like an ebay intake, they are cheap and worth it, but if you buy more expensive and better ones you will get alot more out of them.

 

I wouldnt suggest a ebay strut bar, you dont want it to bend when you take a turn. Spend your money and you will get more for your dollar. As far as strut bars though on my DA I have skunk2 front and rear strut bars and you can tell the difference. It will keep your chasis more rigid and it feels alot more responsive.