Thanks Matimus. I have some E39 M5 headers which are essentially the same as the e39 540 headers and I want to use them and mod them to make them flow better. I have never done it and I don't know if it is worth my time to try. Basically the V8 headers made by supersprint are several thousand and the dinan headers are even more than that. I don't want to spend the money on them at this time.
Thanks for the price breakdown. Did you have to ship your head and block or was it a local place?