TTI makes a great header but IMO, not 800+ dollars great. Especially if you are not running something unique. My dad's 340 car has power steering and power brakes and his much cheaper set of Hooker headers fit like a glove....They have thick flanges, no clearance problems, and they are ceramic coated too. The only drawback is that one header runs through the suspension, but for the 400 dollar difference I didnt mind doing 30 minutes of suspension work. I was impressed with them enough that I bought a set of Hooker's for my 451 and although I havn't installed them yet, for the price difference I dont care if I have to dent them or spend an hour playing with the suspension. The way I see it is that once they are installed, they look pretty much the same and even if I lose a couple HP I could more then make it up with a set of electric dumps with the money I saved. I would go with TTIs is if I was running a Hemi, Indy port engine, or if it was a car like a big block a-bod. I guess what Im saying is that if you want headers that you know will bolt in with very little trouble then go with TTI, but if you want to save a money and dont mind doing a some work then look into other headers.