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Originally Posted by Numba1Stunna
QTP perform a lil better than the kooks do but they dont fit nearly as well, try a search or use the stickies there is alot of info
they are the same headers... i used to sell them... 
there is a difference between qtp/kooks/stainless works" all those are high end" and the lower end, pacesetter, flowtech, ebay headers etc... the middle ground is your hooker coated and stainless maybe SLP too, it all comes down to you get what you pay for, performance wise all LT headers (same size) perform about the same. nothing you will notice while driving. you may get a difference on the dyno of maybe up to 5 rwhp between them all, but you can get a set of ceramic pacesetters for alittle under 400 to your door from most of the sponsers here, alot of people here will tell you thats the way to go, personally i went the cheap route and got pacesetter uncoated 3 years ago they are rust colored now and still perform great. its the best $260 i ever spent perfomance wise. the higher end headers alot of the time have cats that are very easily interchangeable, you may want to put some thought into that if you have strict laws where you are from. if i could do it over again i would get the pacestter coated and get either 3 bolt flanges or the ball flanges installed and get that done to my pacestter y pipe as well to ensure a leak free connection at the header y pipe joints,
I was tempted to buy the pacesetters because of the price but I saved my money and bought the QTP's and it was worth waiting the extra couple of months for. They fit perfect they dont touch or rub anything and I didnt have to touch the K member.
QTPs are good, stainless steel, good looking header, Not a good fit, but they come with high velocity merge collectors which apparently show a good top end gain in HP, Kooks are equally the same stainless steel, good fit, expensive for the name, no velocity collector unless requested, but you can find some good deals.. ARH newer company of the three, stainless steel, velocity collectors (i dont know about fitting). Pacesetters cheapest bang for buck, rust after a couple of weeks, good fit
i just bought the stainless headers and y pipe from the new sponsers for 550 shipped, cant beat that concidering its all stainless steal and you get headers and a nice y pipe, couldnt be more pleased, very nice headers
Just so you guys know... Kooks makes the headers for QTP, or at least they did back when I worked at RKSport... I spoke to the Kooks guys and they told me "it's a little insider secret but we make and have designed the headers for QTP"...