Just posted dyno test results of the RSD Tracker two-into-one high pipe for XL's, in our library of XL exhaust tests. You can read the full test here: http://www.hammerperf.com/ttxlexhaust.shtml#rsdtracker (http://www.hammerperf.com/ttxlexhaust.shtml#rsdtracker) but here's a tease:
(http://www.hammerperf.com/images/patriotvsrsdtracker.gif)