I'm thinking about getting a header for my eg si. Right now i only have an intake and exhaust. So the question is it worth the money to get one. Some guys is selling some no name one "rocketz 4-2-1" for cheap. So i don't know if i should get it. The price is good, but i don't know might just be a waste of my money. Would i notice big gains or not? Also does anyone have any experience with this brand of header??