Hi Rick,
This is interesting and difficult, the collectors are usually the choke point on stock exiting headers. Takes a little deciding on pro's and con's of what offered, take a look at this thread;
http://pantera.infopop.cc/eve/...562/m/7271035046/p/1
Personally, I wish I had avoided buying new headers, used what I have and put some new collector's on them using the info below;
http://www.spdexhaust.com/pdfs...Merge_Collectors.pdf
Then used Midengine Mike's idea for the rest;
http://pantera.infopop.cc/eve/...0045562/m/4850059725
I have recently bought a new set myself from an outfit on the East Coast, and eventually will remove the set I have and install them.
Good luck, Mark
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