Will a new tubular manifold/dump pipe worsen emissions?

[Luke]

As the title says, i'm trying to see if a new manifold will worsen my situation with passing emissions. Right now, most of my exhaust gaskets on my manifold and turbo flanges are starting to leak and i want to get in there and replace the gaskets. Will a tubular manifold and dump pipe make any difference in my emissions?

[SpeedRacer1]

If it does anything at all it will make them worse.

[Luke]

If it does anything at all it will make them worse.

That's what i was thinking. I was just wondering if it will be an insignificant or major increase.

[ILikeMy240sx]

hmm I dont think exh manifold has much to do with emissions if you are talking about CO and NOx levels...

Those are related with what happens in the combustion chamber not with the exh manifold.

[Luke]

Yeah, i started thinking that better flow = more emissions. But i'm thinking it isn't going to be that much different compared to the stock setup.

[SpeedRacer1]

There wouldnt be too much difference, but I have known people who took emissions tests and failed then put on a stock exhausts and passed. So chances are every change to the OEM exhaust and emissions equipment changes emissions results.

[PROJECTRB240SX]

THATS NOT BECAUSE OF THE EXHAUST... ITS BECAUSE OF THE CARBON RESTRICTIONS IN THE EXHAUST.