You, your neighbors, or your wife and, now kids, tired of listening to that flow 40 or cherry bomb glasspack on your droning 4.0? Install a magnaflow 12586 5x11x22 from Performance Curve.

After installing a 4x9x18 xlerator (magnaflow knockoff), then a knockoff turbo muffler from PC, my XJ was still droned and was still too loud for my tastes.

So mudfrog sent me the 12586. It is perfect. Nice mellow low rumble with no drone. I am running the 12586 on my F-150 as well. I can hear my mud tires again, when AC/DC isn't rattling my 6x9s!!!

As many others have said, They provide great customer service to the XJ nation. Even the over 40 crowd.