Re: Car Upgrade Purpose
If you want to pass emissions you have to leave the original stuff on from the Catalytic converter up to the engine, IE: the catalytic converter and the EGR valve. If your looking to do exhaust do a cat back system, from the catalytic converter back. You can get high flow catalytic converters too if you want to go that route.
I don't know what state you live in or how they test for emissions, but here in the part of PA that I live in, it's just a visual, the parts just have to be there. If they hook your car up to a machine you'll have to have, say, smog legal headers and a catalytic converter to be able to pass emissions.
When all else fails...Ham Radio!
I still have the same old HP DV9700T laptop I've had for years...still kickin'