Manifold For 11HP GX340 13HP GX390 This manifold is designed for compatibility with 11 horsepower GX340 and 13 horsepower GX390 engines.It facilitates efficient exhaust flow and is engineered to fit standard mounting configurations for these engine models.Constructed from materials, it supports under typical engine conditions.The design allows for straightforward installation and integration into existing exhaust systems. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.