I just installed the Off-Road Y-Pipe from URD for my 2008 4wd Runner. I ordered the one for the Taco. The only difference is that the hanger mount is on the opposite side, so I had to relocate it. Also, where the pipe attaches to the cat-back portion of the exhaust, its about 6 inches longer. I am in the process of fabricating a part to attach both pieces. Other than those tow minor fabrications, i owuld say that this is a good fit for the 4Runner. On the 4wd pipe like mine, it reroutes the down tube so that it doesnt get pinched up underneath the linkage. It actually sits higher up underneath so it is harder to get caught up when going off-road. I also have the headers which I have not installed yet. I ordered the same long tube headers that is for the Taco. Once I get the exhaust completed, I will determine if I really want to go with the headers since it is a much harder mod to reverse in a warranty situation. Overall, I want to hear how loud the exhaust is before going any further. Depending on the loudness of the y-pipe, I will probably go with the matching cat-back system from Doug Thorley since it is reasonably priced. I will post my results once I complete the fabrication......