Best Exhaust Borla Multicore Muffler 2.5" Center in out 4" Round x 16 Borla Tundra ATAK True Dual Exhaust System with Chrome Tips; Same Side Borla 2.25in Dual In Out 19in x 9.5in x 4in Turbo XL Muffler Borla ProXS 2.5" Center Offset 19" x 4" x 9.5'' Muffler 40665 eBay Borla 40358 Borla Pro XS Muffler Center Offset Oval 2.5 in. Inlet 2.5. 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.