This is a good used exhaust manifold from a 2000 Seadoo GTX. Part number is 290979604  

Assemblies where 290979604 is used
1998 GSX Limited, 5629/5845 - Cylinder, Exhaust Manifold
1998 GTX Limited, 5837/5842 - Cylinder, Exhaust Manifold
1998 XP Limited, 5665/5667 - Cylinder, Exhaust Manifold
1999 GSX Limited, 5848/5849 - Cylinder, Exhaust Manifold
1999 GTX Limited, 5888/5889 - Cylinder, Exhaust Manifold
1999 XP Limited, 5868/5869 - Cylinder, Exhaust Manifold
2000 GTX DI, 5649/5659 - Cylinder, Exhaust Manifold
2000 GTX, 5653/5669/5544/5545 - Cylinder, Exhaust Manifold
2000 LRV, 5688 - Cylinder, Exhaust Manifold
2000 RX DI, 5646/5656 - Cylinder, Exhaust Manifold
2000 RX, 5513/5514 - Cylinder, Exhaust Manifold
2000 Sportster LE, 5693 - Cylinder, Exhaust Manifold
2000 XP, 5651/5655 - Cylinder, Exhaust Manifold