Alright, well I thought I had an exhaust leak for a while. Went and had it checked just to be sure and sure enough it is an exhaust leak due to a crack in my exhaust manifold. I figure at this point I might as well just replace both exhaust manifolds with headers as the increase in horsepower would be nice and I've heard that it can increase fuel economy to some extent, but not so sure about that one. However, my main reason for choosing headers as a replacement is it's cheaper. At least compared to what I've found. Now my question is where is a good place to find V6 headers as it seems Summit only sells V8 headers. And also while these are not compatible with my model, is a brand such as these (http://www.summitracing.com/parts/psm-70-1346/overview/year/2008/make/chevrolet/model/silverado-1500) a good brand of headers to use or do you really get what you pay for? I don't want to save up and pay $600 for headers if I don't need to. My trucks specs are a Silverado 1500 V6 4.3L.