Emissions

[zakx]

Hello, I am doing the full engine build on my AEB with the gt30 turbo. my question is, what cat can I use to pass emissions but still have good flow and all that? I am in colorado and we are required to do emissions every 2 years and they run a pipe on the exhaust to scan for emission so cats are needed but I also wanna have a high flowing exhaust

Thanks

[nynoah]

http://vibrantperformance.com/catalo...1468_1469_1326

[GrapeBandit]

http://vibrantperformance.com/catalo...1468_1469_1326

for $500 its cheaper to buy test pipe and just plug stock cat back in for emissions testing

[nynoah]

When I lived in Colorado, I had to put my stock CAT back on for emissions testing. The standard HFC could not pass their sniffer test. This is why I advise the CAT I posted above. Its expensive but people are having great results with it.

[ray4624]

for $500 its cheaper to buy test pipe and just plug stock cat back in for emissions testing

But he's not running an elim so he would have to take his whole turbo, manifold etc out and swap back to stock.


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[GrapeBandit]

But he's not running an elim so he would have to take his whole turbo, manifold etc out and swap back to stock.


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ahh, i missed that part. looks like OP is fucked outof $500 then

[Avant Nate]

I'm in a similar boat. 2.5 years ago, I had to emission my uni 415, 28rs, psi mani setup. I put a 3in heavy duty cat at the base of my downpipe and ran it at wastegate pressure 10-12 psi.
My obd port had broken off the driver bolster, and so it was hanging to the side, next to the hood release. The girl there was too heavy to look down there, and when I tried to explain the obd situation she blew me off. So they did a manager override and ran it on the rollers, no odb. My numbers came back awesome, well below the limits, but failed for visual on the second O2 sensor.
Changed back to stock and passed, with both cats. After testing, reinstalled everything, no cats.
Couple months ago, due for testing again, I returned it back to stockish, and passed just barely. But they didn't check under the hood either time I had my OBD working.
My suggestion, and what I will do in the future. V-band in a heavy duty cat, and make sure you can pass readiness for all sensors. I personally think that I've wasted a ton of time the last two times returning to stockish.
This was the cat I ran, rediculously low numbers.
https://www.amazon.com/Magnaflow-946.../dp/B000XQQQ2M

[nynoah]

This is why I advise just buying that very high quality high flow CAT.

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[HUFset]

Theres a cheap universal 3" cat made by goerlich/AP exhaust. Make sure you buy the "heavy duty" one and make a v-band section after your downpipe. Troy @ Apikol recommended this to me and he uses them on all his BT builds in CO. I use one, they work and cost around $100 plus v band and fabrication. I made one for one of my other cars, they pass easy in CO on the sniffer.


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[zakx]

Thank you everyone for the advice. I still have about a year and 11 months for my next emissions I just wanted to make sure its something that can be easily done. I never had the emissions people open my hood and check tho its always been ran on the dyno or they used just the obd port for cars less than 10 years

[MagnaFlow]

ZakX, we offer universal 49-state legal replacement cats that work with B5 Quattros for around $125 each, or direct-fit OE replacements in the $450 range each. Here are the part numbers for all compatible models:

#51234 - OEM grade universal
#99234HM - Standard grade universal
#22960 - standard grade direct-fit
#51644 - OEM grade direct-fit

If you have questions about any of these parts, please let us know!

[nynoah]

Gotta love it. A company based out of California can not even get their CAT to pass Cali's police state emissions rules

[MagnaFlow]

Gotta love it. A company based out of California can not even get their CAT to pass Cali's police state emissions rules

We have tons of CARB-legal Catalytic converters, we just didnt list those since the OP stated he was in Colorado. If you were interested, our California legal part numbers would be 448605, 448005 and 418005.