BORLA EXHAUST 40670 MUFFLER PRO XS 3IN IN 2X2 1 4 OUT 19X9 1 2X4 W O Borla 40357 Universal Stainless Steel Pro XS Oval Center Offset Exhaust Borla Pro XS Stainless Muffler 3 in Center Inlet Dual 2 1 2 in Borla pro xs muffler, 6.0 YouTube. Value priced BORLA ProXS mufflers share many of the hottest features of our performanceline. Including high quality 300 Series austenitic stainless steel construction, streetcommandingsound and our Million Mile Warranty. Sizes are available for import anddomestic cars and trucks.