high flow cats on 08 f150 question
Senior Member
Joined: Dec 2006
Posts: 43,542
Likes: 819
From: Joplin MO
2 cats, one on each side, between the 2 O2 sensors. If the cats have bungs for O2 sensors, the rear sensors go in them. If you want to run true duals, you should use an X-pipe or a DI/DO muffler with an internal X.