I have stock headers on my 2.8 liter engine, and I was wondering which header is the best for its price im not looking for something to expensive, my price range is anything between $300-$500 pretty much the best band for your buck, and about how much HP would I gain, is it worth it?

 

What you have aren't headers they are called exhaust manifold's. The only header to my knowledge available for our cars are the pace setter headers. You probably wouldn't see a whole lot of an hp gain. They have 2 different models the painted one's that will rust over time and the ceramic coated one's that are much more durable. Don't expect to see huge hp number's from that 2.8 I would advise you read the stickies at the top of the page if your looking to get some power out of a v6.

Painted,
http://www.summitracing.com/parts/PSM-70-1206/

Ceramic coated,
http://www.summitracing.com/parts/PSM-72C1206/