One thing to keep in mind with the TTI headers is,though they fit nice,they make comprimises in performance to get them too fit.I have Hedman 1 7/8 headers on my Challenger with a small block,and one tube on each side still goes out of the fenderwell.I think the main reason is to get all the tubes to fit in a way that does not include sharp bends as soon as they exit the flange.Look at some TTI headers and you will see a lot of tight bends right off the head,but they do fit the chassis nice.
Keith