TM 9-2320-209-10-1 (5) The exhaust system on M49A2C fuel tanker and M275 tractor trucks (fig. 2-11) includes a spark-arrestor-type muffler, which traps exhaust sparks from the engine. 1. Exhaust shield 2. Lower exhaust pipe TA 044904 3. Muffler 4. Upper exhaust pipe Figure 2-11. Exhaust System Component Location (M49A2C Fuel Tankers and M275 Tractor Trucks). 2-13