X pipe vs H pipe

before getting a X-pipe atleast have a good look at it. alot of them look like absolute crap on the inside. some are made out of pressed sheetmetal others are made out of tubing, take a good look and then think about why there is mandrelbent tubing in headers,exhaustsystems and why we spend so much time and money on getting the ports to flow well in the heads then have a good look at many comercialy available x-pipes.