I doubt I'll be making two sets of headers for it!!!! One set is enough work!!!! Think I'll try them on this set... Maybe start at 1 5/8 then out 10 to 12 inches and up to 1 3/4 tubes. I do have a set of the 4 into 2 into 1 merge collectors with the final size being 3". Allegedly these will help scavenge the cylinders and pull a bit more bottom end power...or maybe they just help the bottom end power because of the longer length on the collectors????

As for the David Vizard stuff, I like the idea of a resonator in front of the muffler, just don't have room for it on this car. I have chassis dynoed before and after installing an H pipe... I did notice a decrease in sound level, and a small increase in mid range power.

Thanks for the input, more food for thought.