Its 2.5" piping. You mean a pic of the inside with the piping off? I didn't get a pic before he put the intake on so I don't have one yet. Its just as you would expect it by looking from the outside though. The pipes were cut and welded together, they were shaped to match the opening by the throttle body. Its very free flowing, not restrictive at all, but like I said before... anything is better than the restrictive stock setup.