How to pass emissions without cats

Opal50 · May 21, 2007

I want to get some LT headers this summer with an o/r h or x-pipe. Obviously emssions is a problem if I get rid of the cats. Just wondering if any of you guys know a way to trick the cpu to give good readings or anything like that. I can always just fasten some empty heat shields to the h-pipe for the cat illusion too you know.

blksn955.o · May 21, 2007

20-50$ to the tester...

other than that its prob. not going to happen.

87_GT · May 21, 2007

well where are you from? here in illinois, there was no visual check, just a run on the treadmill thingy. we now do not have to do that in ill., but when we did my buddy had a 383 in his el camino with longtubes and no cats, and he did the test with a couple of bottles of that "Pass emmissions" stuff in there and passed with no problems. i dont know how strict it is where you live though.

blksn955.o · May 21, 2007

I think an el-camino might have alittle less strict smog numbers to hit also...not that the 5.0 doesnt have a good bit of play. Its just going to be harder.

I have seen cars with cats but no smog pump fail by a mile with bottles of GTPm 8* timing...the same car with the smog pump installed passed with a good bit of room. From that alone I think its going to be hard with cats and or smog removed by GTP.

Hell for what 4-5$ though its worth a try.

cjones · May 21, 2007

you could save your old stuff to put on for emmisions. it's a pain but it may be your best choice depending where you are.

nickgt5.0 · May 21, 2007

thats what i did, swapped my o/r H pipe for the stocker and did emissions and then came home and switched it out. didnt take very long either

HISSIN50 · May 21, 2007

There's no substitute for catalyzation. I'd simply budget in a means of having cats when you need them (inserts in your new H-pipe which can have cats or straight pipe, etc).

Good luck.

droptopford 5 0 · May 21, 2007

ya, a custom short h or x pipe with clip in straight pipe or cats might be a good idea, and not too hard... but i know at least here in mass, they are doing away with the emissions testing as you know it. now,(starting '08) for all cars 95 and older, all they do is plug the car in and see if its throwing any codes that would cause it to fail if not then u pass.... plus im guessing there will still be a visual check. but that might be something worth researching in your area. Mass is pretty strict and we're doing this so...

Opal50 · May 21, 2007

Yeah, I'll have to look what the up coming rules are going to be here in Connecticut. I don't know why i didn't think of just custom rigging the cats to come in and out of the h-pipe. Doesn't seem that hard to do either with a little welding.

vp6799 · May 21, 2007

Hey droptop, is that true about the emissions testing here in mass??? I heard rumors about it but no one has been able to confirm it. Were you able to confirm it??

droptopford 5 0 said:
ya, a custom short h or x pipe with clip in straight pipe or cats might be a good idea, and not too hard... but i know at least here in mass, they are doing away with the emissions testing as you know it. now,(starting '08) for all cars 95 and older, all they do is plug the car in and see if its throwing any codes that would cause it to fail if not then u pass.... plus im guessing there will still be a visual check. but that might be something worth researching in your area. Mass is pretty strict and we're doing this so...

94-302-vert · May 22, 2007

CT...

emissions suck man..

You are gonna need cats on there... I haven't found a station yet that will allow no cats (they HAVE to do the visual).... then they videotape the actual inspection...

If you are in NE CT I can reccomend a place that may let you through...

BUT I reccomend using guranteed 2 pass and pull the timing out for the run (my EGR doesn't work and my cats are junk)...

mackey · May 22, 2007

vp6799 said:
Hey droptop, is that true about the emissions testing here in mass??? I heard rumors about it but no one has been able to confirm it. Were you able to confirm it??

Yes. I heard it also from the owner of a gas station. Didn't know 08 was the planned year though.

Therian · May 22, 2007

It's brutal here in Ontario.

They ended the rolling exemptions with the 1988 year. Ever car built after 1987 must get emissions tests every 2 years. They are trying to pass legislation to make 12 year old+ cars have testing every year. They are also only using dyno's for vehicles made before 1998. 1998+ only has to plug into a code reader.

grr...

vp6799 · May 23, 2007

mackey said:
Yes. I heard it also from the owner of a gas station. Didn't know 08 was the planned year though.

ohhhh yea!!!! That's freakin sweet. Can't wait.

vp6799 · May 23, 2007

Opal50 said:
I want to get some LT headers this summer with an o/r h or x-pipe. Obviously emssions is a problem if I get rid of the cats. Just wondering if any of you guys know a way to trick the cpu to give good readings or anything like that. I can always just fasten some empty heat shields to the h-pipe for the cat illusion too you know.

Do like my buddy did. Take the cats off your stock H-pipe. Split them and weld in a pipe so it goes completely through the cat. Make sure it's the same size as your o/r h-pipe. Now fill it half way with sand and weld the top on. Then just weld it into your o/r pipe. It will look like you have functionale cats on your car, but it's really an o/r pipe. The sand filled half way will give it the same cluck sound as the normal ones do, in case they hit it to check if it's hollowed out. Plus you won't have to swap out pipes for inspection time.

He's gotten pulled over a couple times by state troopers, and they always seem to wanna check for cats because the car is loud....lol

droptopford 5 0 · May 28, 2007

vp6799 said:
Hey droptop, is that true about the emissions testing here in mass??? I heard rumors about it but no one has been able to confirm it. Were you able to confirm it??

sorry i havnt responded in a while. my only confirmation of this has been of the rumor type, but everyone seems to be saying the same thing as what i told you earlier. even last night in was at a party and a friend of a friend was talking about it (he does inspections...) he said that basically he hasnt been doin the roler test for a while now on 95 and older cars, as long as he gets a copy of the registartion he will pass my car with the "plug-in test", but let me repaet, we were at a party and he was pretty hammered so whjo knows if he was BS'ing. However, most other places will still need to do the visual, and a loud car will still let them fail you, i believe. so its not that much different unless you were having emissions problems in the past due to something besides an o/r H or X, in which case you were probably throwing codes anyways.

JustA5.0 · May 28, 2007

I'm all are for keeping our air cleaner, just run the high-flow cats if its a street car, you only gain maybe 2HP without em anyways. If you are only taking the car to the track just keep the old stock midpipe and swap it for emissions.

Therian said:
It's brutal here in Ontario.

They ended the rolling exemptions with the 1988 year. Ever car built after 1987 must get emissions tests every 2 years. They are trying to pass legislation to make 12 year old+ cars have testing every year. They are also only using dyno's for vehicles made before 1998. 1998+ only has to plug into a code reader.

grr...

Personally, I think the emissions limits in Ontario are pretty lenient. I've passed all but once and that was a faulty 02 sensor. I don't know if that 1 year thing will ever pass, they have been talking about that for a couple of years now. You could also register your car in Northern Ontario and not have to do emissions

skinemann96 · May 29, 2007

I live in IL too. I tried everything to pass with LT and O/R H.. and failed horrible every time. I tried making a flex tube short H pipe with cats.. that was pretty funny. I tried that "pass emissions" stuff as well and failed. So i when they where gonna suspend my license i kinda found a small loop hole. All i did was sell the car to my parents for free and paid the 100 buck transfer of title. I think that buys you a little over 2 years to not worry about it again. Worked for me twice now and insurance is also a hell of a lot cheaper under my rents then me

How to pass emissions without cats

Opal50

New Member

blksn955.o

87_GT

Member

blksn955.o

cjones

nickgt5.0

New Member

HISSIN50

"How long does it take to get help in here?

droptopford 5 0

Member

Opal50

New Member

vp6799

New Member

94-302-vert

Active Member

mackey

Active Member

Therian

The Highlander

vp6799

New Member

vp6799

New Member

droptopford 5 0

Member

JustA5.0

Member

skinemann96

Member

Similar threads

How to pass emissions without cats

New Member

Member

New Member

"How long does it take to get help in here?

Member

New Member

New Member

Active Member

Active Member

The Highlander

New Member

New Member

Member

Member

Member

Similar threads

Privacy & Transparency

Privacy & Transparency