This muffler is 2" inlet and and outlet size and offers substantially better flow than the stock Vanagon muffler. It is close to the stock size in both diameter and length and fits into our MB4PR muffler brackets with our 6" heavy duty clamps (90888A). It is all welded aluminized construction and weighs almost as much as the stock unit. We generally install this with our high flow cat and a simple tailpipe made with half of a 2" mandrel bend. It fits well in 2wd and Syncros and has a bit more sound than stock but is still quiet enough that the average Vanagon owner is not put off by the noise level. To install this muffler, you will need one FL3-200 flange, two more if you use our high flow cat, and it does require welding the flange to the inlet and welding or clamping the tailpipe. We typically use the 2" muffler and cat for the 2.2 and 2.5L Subaru installations but we have also installed this muffler on a stock Vanagon using our brackets and clamps (the muffler is too large for the original VW brackets). The stock "J" pipe works well with the 2" exhaust.
2" High Flow Muffler # 025M2