ok...the smog pump SUCKS exhaust gas from the x pipe and pushes it INTO the back of the heads. You can ditch the WHOLE THING with no ill effects. There will be a metal tube that comes off the back of the heads, this needs to get plugged. You're a big boy....figure that out. Rubber caps on the bungs of the tubes work or if you can get back there, you can put a plug in the heads themselves. You also have to plug the hole on the mid pipe set up or else it will be one BIG ASS exhaust leak. I don't remember there being any vaccum lines. All my shit is LONG gone (egr, smog, etc) but if there are, make sure you plug them as well. This can ALL be done without tripping a check engine light. The only REAL benefit is a cleaned up engine bay in my book.