peterWU8

iTrader: (1)

I live in California, and what I plan to do is put long tube headers and give it a tune (maybe LS6 intake if I can get the funds by then).

Question #1: (not really related to thread) If I get headers WITHOUT AIR/EGR, can I just simply plug the AIR/EGR valves that would go into the header plugs (which are not there)? Would that be the same as removing it, without actually removing it? (I want to keep it for future smog purposes).

Now, question #2, the main question: If I get headers and get a tune, will I pass smog IF I change my headers back to the stock ones? Or would I have to re-tune with the stock headers to pass smog? I plan to keep the stock headers with the cats for smog, I just want to know if I will be able to pass smog after getting a tune with long tubes, and switching back to the stock ones.

99Bluz28

iTrader: (35)

Question #1
Yes, just get some block-off plates for the AIR/EGR mounts on the headers.
Question #2
I would recommend having it tuned for the stock exhaust manifolds & cats. If you switch it back to stock after getting it tuned for LT headers & ORY-pipe you'll likely FAIL smog. I'd talk to your tuner he should be able to explain this a lot better then I can.

peterWU8

iTrader: (1)

Ok, thanks. What I meant for question #1 was actually the opposite. I mean if the headers have no EGR stems for me to connect my EGR valves to, could I just leave them there?

z-maro

iTrader: (18)

I'm sure you could use the block off plates in the opposite way to block off the AIR/EGR lines (opposed to the headers like most use them for), however at that point I think that you would be better off getting headers with the emissions ports. If you get "race" headers and keep the AIR/EGR lines in the car I would assume that they would be flopping around in the engine bay which probably wouldn't be good.

peterWU8

iTrader: (1)

I would really like to get headers with the AIR/EGR lines on them, but the only ones that have them from my local shop are the 1 3/4 primaries. They also sell the 1 7/8 primaries, which are the ones I want, but they don't have the EGR lines and are called "race version". So I was just wondering if it could work that way.

z-maro

iTrader: (18)

Then just buy some 1-7/8" headers with AIR/EGR fittings from a vendor here and likely save some money at the same time.

peterWU8

iTrader: (1)

Haven't looked around much on these vendors, how much do they charge for a set? My local place sells them for $269 a set.

RevGTO

iTrader: (12)

Your best investment would be in EFILive or HPTuners. That way when you reinstall the stock manifolds and cats for inspection, you can reflash it to the stock tune. Then once you pass, pull them off and reflash your LT tune. You're in control and you don't need to rely on a tuner.

I'd definitely get LT's with EGR and AIR ports to save the hassle of reinstalling those systems as well as the manifolds and cats. Be careful to get good quality, because those tubes have been known to break off.

Lastly, you're a better man than I to go through a complete header uninstall and install every two years. If I move back to CA full-time, I'll stick with manifolds and cats. That's the plan for my M6 car.