2- 3 inch magnaflows. Straight thru design and quieter than the previous flowmasters. I got dynomax ultra flows originally,but they had baffles and I wanted the more of the straight thru design. The shop which was going to weld in the new ultraflows showed me the magna flows. Even with the staggered outlet I could look thru from one end to the other. They have to be the best flowing. 
