Hammer, I have a set of the Performance Welding SS headers on my car, they were on it when I bought it so I don't really have anything to compare to - Mark from Performance is a really good guy, and told me that these headers were meant to be mass-produced and were designed to fit a variety of engine combos, i.e. they are not custom headers just affordable stainless merge headers. He builds a lot of comp elim. stuff that is max HP but very pricey! So far I really like them, they work well and clean up easy. I don't think they will blue, but instead are getting a little gold tint to them. As far as power gain, that's a crapshoot. I think they are on sale @ $850 right now which is a deal tho...... 8) JB