Check out 3D Exhaust Manifolds of Engine 633 3D model on CGTrader for $39. High-quality mesh by 3D-Horse: 36897 polys, 37195 vertices. PBR.
OBJ (OBJ, filesize: 2.34 MB), LWO (Lightwave, filesize: 645 KB), MAX (Autodesk 3ds Max, filesize: 3.14 MB), 3DS (3D Studio, filesize: 440 KB), C4D (Cinema 4D, filesize: 441 KB), HRC (Autodesk Softimage, filesize: 1.73 MB), FBX (Autodesk FBX, filesize: 3.79 MB), UNITYPACKAGE (Unity 3D, filesize: 3.79 MB)