just found this dump pipe on ebay
NAVARA D40 2.5" TURBO DIESEL DUMP EXHAUST PIPE SS - eBay Pipes, Exhausts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 21-May-10 16:39:50 AEST)
i dont see the reason wearing a seatbelt in the bush doing 20kph opening gates all the time when you dont see a car for a hour . maybe your car is a city shopping trolley