This is a DA85 with a Silent Beauty TBM pitts style muffler. I was hoping to have the pipes come out behind a cowl flap cut out of the cowl but this is what I need to do to get the cowl to go on. Will the exhaust pipes themselves make this enough of a low pressure area to cool the engine. I will be adding ducting in front of the cylinder so that all the air that comes into the cowl will flow over the engine's fins.