Hey hello John. Good to say hey to you. You were right, these are the only ones we can use for our high powered turbo builds as far as I could determine. Matt and Im thoroughly impressed with Kevin's knowledge and how he came about to building his own manifolds. If I recall correctly the manifolds are about $850 or so. Matt's shop paid for them and I have not yet seen the invoice. I'm so glad you chimed in when you did about these manifolds, they are a work of art..... Thanks again Turbo Monster Monte....