Thanks Red Chevy, the port is 3.75 id. And my exaust is 2.375 od. The 5.3 vortec is mounted Ridgid to the frame. (I have a poly rear Trans mount to protect the tail shaft brg from vibration.) Ill mount the exaust ridggid also and add small stainless flex couplers to allow for expansion an contraction. I'm thinking that will limit movement enouph. The exaust will then travel through mufflers and out the bed skirt in front of the rear wheels. I'd love to hear suggestions this is my first build.
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