when you figure the price of turbo, innercooler parts, tubing, header materials and the time to weld everything up and get it to fit properly, the firts time, and misc, items yes if you have all the equipment and expertise to biuld everything you can do it cheaper. that is if everything works right the first time, but it won,t take too many mistakes to add up to what you could have bought a tried and proven kit for.