im puttin on a FM Super 40 and new cat..
what size piping comes stock on a 94 4runner SR5 3.0 4x4?
information will be very helpful

 

I'm going to do the same set up! Painting my truck in two weeks then in late june I'm doing the exhaust. Anyway from what I've gathered from other people on here is he stock exhaust is 2 1/8 and they say to just go ahead and move up to 2.25 because of availability. Also I heard to find an exhaust shop that has a mandrel bender because they don't crush the bends there for you get more flow. When you get done it would be nice if you would post a video so I can here how it sounds! Hope this was helpful and good luck.