V-10 Bob, coincidentally I have just ordered a set from ssautochrome but they won't be in for about another week or so. To answer your question the best I know...a friend and I are starting up a speed and performance shop, he has built quite a few race motors and oddly enough has seen the ads from ssautochrome. From what I gather he has heard some good things about these headers, however, one of the reasons for the price is cheap hardware (if you do get them buy a set of ARP header bolts, you won't be sorry you did) The headers themselves are a good set of s.s. that will compete w/ some of the higher priced from hooker or even MP. I would recommend trying them (you may have to grind some of the flange off the drivers side as others have said) for that kind of money, sometimes you get more than what you pay for. Remember this is only what I have heard, but I will soon find out for myself. Thanks for the welcome.