Thanks for the info! I always thought removing the factory damper was a bad idea. My car is still returnless but the factory damper was removed to install -8AN feed line and billet fuel rails. It drives fine for the most part but occasionally exhibits strange behavior when pushed hard that could be fuel pressure related. I may end up ordering one of these Radium pulse dampers as my fuel rails already have -8 ORB fittings in them so the damper would fit right in.
My rails (fore) have a -8 on the front as well but I don't think there was enough room with the diameter of the damper being too great. I ended up going with the 3/8" npt version and buying a stainless adapter to go to 1/8" npt. Then I just threaded it into one of the 1/8" ports made for gauges.