Muffler Advice

I'm not sure about flow numbers but I got a great deal through advance online last week. I bought 2 magnaflow mufflers for $82.82 shipped to the door. I bought center in offset out 2.5" mufflers. 13216 is one of the part numbers. Just figure out what you need inlet and outlet. They have all configuration. $57.99 per muffler. Enter code a124 and you'll get $40 off and still be over $75 for free shipping. Mufflers are great quality and there are other hi performance mufflers online with advance. They have flow master too. Order them 1 at a time if they are hi enough in price just with final totals for best deal.