I'm running a set of hooker's and they work just fine . Cost me 250.00 I will bet those high dollar babies don"t flow much or any more them the Hooker or Dougs, save your hard earned money, buy smart . mine are 1 3/4 tubes 3.o collecters with 12inch down turn extentions . I have all the power I need on my 360 cu inch. with J heads. Just think you will have $$ 2900. to spen on more speed equiptment. Good luck, Gary.