| External waste gates connect to the exhaust manifold, and then uses a turbine housing that does not have an integrated waste gate. Here is my exhaust manifolds that uses external waste gates. 
You probably want the external wastegate sound because of the sounds they make .. which are kind of cool but kind of loud and at the same time also drop exhaust near the front of the cabin and for that reason I been thinking of piping mine back into the exhaust pipes.

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