Ebay.. Dodge Durango. 3 1/2 OD. They typically want 50 bucks, but 1 seller has dropped to 30 with free shipping lately. Now how are you going to stuff that under the hood with the stock elbow and maf housing? I've got a needswing elbow with maf built in so I purchased the above, just haven't moved it up the to do list for installing.