I have a used downpipe(4 Bolt),log manifold t3 flanged, dump tube. Its made my jgfab.com carrys a lifetime warranty. Its setup for 38mm external gate. No cracks or anything. The manifold is stainless steel, but the downpipe and dumptube for the gate isnt. It has surface rust on them. I will cleanup before sale. The downpipe is 2.5 inch with flex section. No a/c. Not sure about p/s.