I have 1975 o/i 41 I repowered with a perkins 4-108. The former motor was a nissan. The old muffler was mounted on the bulkhead where the cooling water was mixed. The 4-108 mixes the cooling water at the manifold. My question is where can you mount a lift muffler? I have heard under the shaft, if so what muffler fits and do I need to pull the shaft to install? If anyone has been threw this please help I cant afford to get this one wrong.