I don't think you'd need cap for a 300/2 amp...
If you do go with one, I've always been happy with my 1 farad Rockford cap. Never once had a problem with lights dimming, and my amp is far higher powered than yours.
I think it was around $100 when I bought it from Best Buy...
Last edited by RevMonster; Jan 11, 2004 9:44pm.