Caterpillar 3406, Exhaust Manifolds, (GOOD USED) Caterpillar 3406 3-Part Exhaust Manifold Diesel Engine For Sale, End Part # 4N270-3-, 4N270, 4N270 3, Center Part # 4W4384-2-, 4W4384, 4W4384 2, REF Center Part 4W4384 2 (1), REF End Part 4N270 3 (2), Stock # 7349 | Tested & Inspected!