SHOtime2511
CGP
Isn't the magnaflow Y marketed as a factory replacement?
Bombed emissions bad...
- Thread starter biker889
- Start date
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luigisho
SHO Member
I suppose it might be. The question is whether it's 49 or 50 state legal. Really though new magnaflow aftermarkets will often throw a code on GTPs. There is a good bit of difference in how well they work vs oem cats.
xshoel93x
SHO driver
apparently in Pa they still do emissions on 17 year old cars? no cats n Ma ftw (for once zomfg) [never understood why they dont do emissions on older cars when they tend to pollute more than newer cars, i think its backwards ass]
anyways, o2's and a rad flush chief.
anyways, o2's and a rad flush chief.
biker889
SHO Member
Took my car back in today and passed with flying colors...
i swapped out my aftermarket y-pipe back to my stock one.
and pulled the spout just to be safe.
CO-.06, HC-66,NOx-522.
Quite an improvement...
i swapped out my aftermarket y-pipe back to my stock one.
and pulled the spout just to be safe.
CO-.06, HC-66,NOx-522.
Quite an improvement...
Bob Gervais
Wut?
Quite a disappointment in the aftermarket pipe though...
SHOclass
Conan has one
Just passed emissions yesterday here in CT with no issues on my 95'. All original exhaust minus the cats which I replaced 6 years ago or so with a stock Bosal or Walker system. (I can't remember which one) Has anyone had any consistant issues with passing emissions with a SHOsource high flow Y-pipe? I hope to upgrade shortly.
Thanks.
Thanks.
biker889
SHO Member
I am actually running a sho shop equal length y-pipe with two universal magnaflow cats. I dont know if the cats just flow too much and dont heat up properly or what. however, the cats have a warranty on them, i am going to exchange them and probably just sell the pipe and buy a complete magnaflow y-pipe.
Why the downgrade?
hawkeye18
Sorta cares
Because the SS Y-pipe causes him to fail emissions.
Though, I don't see why you couldn't have magnaflow cats welded into the SS Y-pipe. Then you could keep the HP advantage of the equal length pipes.
biker889
SHO Member
Thats currently what i have...and it failed. Not sure why, cats appear to be fine. Its the same cats shosource offers with there y-pipes...i wonder if they have had any problems.
hawkeye18
Sorta cares
SHO Shop was fairly (ok, really) notorious for products of dubious quality. I would not be surprised if the cats in it were known not to work well. SHOSource has much higher quality products, and I would trust their products far more than anything that Vadim made.
intimdatr
Got Cams?
maybe a small change, but id also recommend checking the plugs. could help a little.
but living in almost rural Missouri emissions aren't really a big deal down here...
but living in almost rural Missouri emissions aren't really a big deal down here...
We do use the same Magnaflow cats in our y-pipe and I think there has only been 1 failure to date. They were good about the warranty though.
I have the SHOSource y-pipe with Magnaflow Cats in my SHO and I pased here in CA for emissions.
Just saying it would be better to swap out the universal cats.
biker889
SHO Member
I actually am leaning towards the O2's. When I put the new pipe in I installed new 02's. The car never did run 100% after that. When i failed emissions, I installed the factory y-pipe and original O2's and passed....
I am just going to install new cats, and new O2's AGAIN....and see what happens.
I am just going to install new cats, and new O2's AGAIN....and see what happens.
I just had emissions done here in CO and I have a custom y-pipe and no cats so I thought I would see how it did. I had similar results as your original post except NOx was only 4.2 gpm. I added a single aftermarket cat after the y-pipe and still failed but it was close. Then I pulled the spout and fast-passed! Burned super clean after pulling the spout.
Lorenr
Member
Passing Emissions with Catalytic Converters
I find it hard to believe that you would fail your emissions testing that badly even if you had no catalytic converters. I'd seriously look somewhere else.
Check your plugs, plug wires, O2 sensors and run your codes. You have other issues. Replace the air filter, check the Idle Air Bypass sensor.
If the motor is running properly you really don't need the catalytic converters. Cars sail through testing all the time with "punched" converters. I know. They just need to be properly tuned and hot. Pulling the spout is not the answer either. This forum is about making these cars run properly not cheating on emissions.
:swing:
I find it hard to believe that you would fail your emissions testing that badly even if you had no catalytic converters. I'd seriously look somewhere else.
Check your plugs, plug wires, O2 sensors and run your codes. You have other issues. Replace the air filter, check the Idle Air Bypass sensor.
If the motor is running properly you really don't need the catalytic converters. Cars sail through testing all the time with "punched" converters. I know. They just need to be properly tuned and hot. Pulling the spout is not the answer either. This forum is about making these cars run properly not cheating on emissions.
:swing:
hawkeye18
Sorta cares
No, a pretty good part of the forum is about making these cars cheat on emissions. Search "Pull SPOUT" if you don't believe me.
Lorenr: Obviously you don't understand what a catalytic converter does so look it up. If we didn't need them then why do we have them? You also forget that most of these gen1 and gen2 shos don't have an egr which does what....... don't mean to be an a$$.
sperold
Last to Know
I installed the Shosource equal length Y-pipe with cats in February as a last attempt get my car through the e-test (95 MTX).
It did the trick: Here are my numbers:
HC - 10 ppm
CO - .01 %
NO - 432 ppm
To show you how rough they are on the cars in Ontario Canada, here are the max limits, above which you fail:
HC - 58
CO - .32
NO - 435
I almost failed on the NO.
If you are worried about the quality of the cats.... you can buy the same part number converter with "HM" after the numerical part#. They are not the California grade, but they have more of the good stuff than the standard converter.
If your are suspicious of the cats you have, get your hands on a heat sensor gun (everyone seems to have them now) and get a readout of your cats at the entrance and exit of each one. Both ends should be 600 degrees.
It did the trick: Here are my numbers:
HC - 10 ppm
CO - .01 %
NO - 432 ppm
To show you how rough they are on the cars in Ontario Canada, here are the max limits, above which you fail:
HC - 58
CO - .32
NO - 435
I almost failed on the NO.
If you are worried about the quality of the cats.... you can buy the same part number converter with "HM" after the numerical part#. They are not the California grade, but they have more of the good stuff than the standard converter.
If your are suspicious of the cats you have, get your hands on a heat sensor gun (everyone seems to have them now) and get a readout of your cats at the entrance and exit of each one. Both ends should be 600 degrees.
