Thats how my truck is and it works great. But my goes dual 2 1/1" in single 2.5" out and thats at the cat not the muffler.
yeah my mistake dual 2 1/4" in to 3" single out 70 series http://app.infopia.com/Shop/Control/Product/fp/vpid/3233921/vpcsid/0/SFV/32214