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I understand that once you mod the car it has less reliability. Right now I have a 2007 sti with 55k miles on it. I have been running stage 2 for about 15k miles @ 20psi stock turbo tune done by jon drenus @ cobb. I haven't had any problem, but I was looking into putting on an uppipe and external wastegate. I was just curious as to what you guys have on your car and how long has it lasted you? Is the uppipe and EWG worth putting on? (this is also my daily)
 

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What are your inspection requirements?
 

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^^^This. It would suck to have to change all that out if you have to get inspected for emissions every year.

A standard UP isn't really worth it...but you will have to change it out if you are going EWG, which is why I assume you mentioned it. Get that tuned and you'll be able to hold more boost reliably. But on the VF39, it's not that worth it. If you have future plans...not a bad idea.
 

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What are your inspection requirements?
Would an EWG be flagged by a visual inspection?

I never thought of it interfering with emissions.
 

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Would an EWG be flagged by a visual inspection?

I never thought of it interfering with emissions.
It certainly should. In fact I would be dismayed if it is not.

I know there have been turbo cars that have fitted catcons on their wastegates. The Impreza does not need to do so since the correct turbo is internally gated. It is also unlikely IMO that fitting a catcon on an external gate after swapping would somehow make the car "legal."

In any case, the OP needs neither a wastegate nor an up pipe, so all this is academic I suppose.

EDIT: I should specify that when I say there have been cars with catcons fitted to their wastegates, I mean specifically fully legal, factory setups; I also mean specifically fully stock Porsches.
 

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It certainly should. In fact I would be dismayed if it is not.

I know there have been turbo cars that have fitted catcons on their wastegates. The Impreza does not need to do so since the correct turbo is internally gated. It is also unlikely IMO that fitting a catcon on an external gate after swapping would somehow make the car "legal."

In any case, the OP needs neither a wastegate nor an up pipe, so all this is academic I suppose.

EDIT: I should specify that when I say there have been cars with catcons fitted to their wastegates, I mean specifically fully legal, factory setups; I also mean specifically fully stock Porsches.
In all fairness, it was an honest question. Those hot turbo gases are tough on cats. I can't imagine the small amount of unfiltered air making a large difference compared to the damage done by the extremely hot air hitting the cat. I am not a specialist by any means, however, and it is nothing more than an educated guess vs. laws that are beyond my control to begin with.

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In all fairness, it was an honest question.
Oh yes, sure, it's simply a discussion of something interesting, nothing more. I don't know how the factory-fitted cats faired over time. I just spoke to a friend that doesn't recall what happened to his older 911 either. I do know the arrangement did exist in the wild, and was done to meet emissions standards.

This actually brings up something interesting: It may not matter how the catcons faired over time, or if they worked at all. In CA, 2WD cars are tested on a dyno at low and midrange RPM. 4/AWD cars are tested statically. Either way, the wastegate(s) would not be engaged. This implies all the catcons had to do was exist, not work.
 

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Oh yes, sure, it's simply a discussion of something interesting, nothing more. I don't know how the factory-fitted cats faired over time. I just spoke to a friend that doesn't recall what happened to his older 911 either. I do know the arrangement did exist in the wild, and was done to meet emissions standards.

This actually brings up something interesting: It may not matter how the catcons faired over time, or if they worked at all. In CA, 2WD cars are tested on a dyno at low and midrange RPM. 4/AWD cars are tested statically. Either way, the wastegate(s) would not be engaged. This implies all the catcons had to do was exist, not work.
Over here, for obdII, it's just a code check and visual check.

I am curious if a visual check goes over the wastegate. I thought they basically looked for two cats and that's it.

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Over here, for obdII, it's just a code check and visual check.

I am curious if a visual check goes over the wastegate. I thought they basically looked for two cats and that's it.
I bet it could depend on the particular tech doing the inspection, and the day, how busy etc.
 

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I bet it could depend on the particular tech doing the inspection, and the day, how busy etc.
Much like the cat in the down pipe I bet.
 

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Heide264 said:
Would an EWG be flagged by a visual inspection?

I never thought of it interfering with emissions.
Absolutely. It bypasses two emission control devices (and replaces a third on the 2.0L).

Exerpt from NYS VTL:
Every motor vehicle, operated or driven upon the highways of the state, shall at all times be equipped with an adequate muffler and exhaust system in constant operation and properly maintained to prevent any excessive or unusual noise and no such muffler or exhaust system shall be equipped with a cut-out, bypass, or similar device.
In terms of a visual, an EWG dump tube is quite obvious to the inspector if they actually do it (it's common here to skip that part and just do OBDII), and if they actually care, they'll fail you.

In terms of emissions alone, the EWG isn't bad unless you exceed spring pressure.
 

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The funny thing is, would a basic emissions tech or even an average shop owner doing an emissions inspection, even know what an EWG setup is or how it actually replaces something else? I'm willing to bet that most don't have a clue since most work on your basic 4 and 6cyl engines. If visually, they see a cat in the exhaust coming under the car, they'd probably slap an "Ok" sticker on it and be good to go (pending codes, of course).
 

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Mikie13 said:
The funny thing is, would a basic emissions tech or even an average shop owner doing an emissions inspection, even know what an EWG setup is or how it actually replaces something else? I'm willing to bet that most don't have a clue since most work on your basic 4 and 6cyl engines. If visually, they see a cat in the exhaust coming under the car, they'd probably slap an "Ok" sticker on it and be good to go (pending codes, of course).
They would see an exhaust outlet dumping gas before the catalytic converters. Whether they understood what it was used for, they wouldn't pass you if they actually cared

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