Factory manifolds. It's 2 1/4" (same as the manifold) to the Y, then up to 3". The passenger side wraps forward, under the oil pan, then back to connect to the drivers side. This way, nothing is below the line of the frame or engine. There may be clearance problems with the front driveshaft if you have less than 4" of lift.
Muffler is a 3" welded Magnaflow, along with a 3" high flow cat above the skid pan.
Bob
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