Catalytic converters welded onto a H-pipe

[tacomatrx450f]

i have a Mac offroad H-pipe and i need to pass smog so i can drive it again legally i hear the fines like 5k in cali if you are caught without them . does anyone know if you weld some Catalytic converters to a H-pipe will it pass smog?

 

[Cjfoxbody13]

I dont know if thats will work... But it should be a possibility since the make h/x pipes with Cats....

 

[LarsD]

You might have problems down the road with the cats if you don't have the smog pump hooked up. I think thats what the problem with my old 89 was.

 

[TechSteele]

When I got my car it had straight pipes with an H off the headers.
I tryed to get a pair welded in and ran into problems.
The biggest one was, there was no room.
The regular straight cats from magnaflow wouldnt clear the frame/floor boards.
By the collectors was tight, and by the drive shaft it would have rubbed on the floor.
There are angled ones that MAY fit by the collectors, but you really have to check for fitment.

These cars originally came with > 4 < cats, so two small ones will not be enough to pass emissions.
Two large ones can work, but need to be broke in some before the tests. (Brought up to full temp, and ran for at least 10 miles/minutes a few times, and before the test.
Mine had its conveters in for all of 20 minutes when i went for the test here in Ohio, and it showed 10 times the junk what they wanted to pass. I have a year to get it ready for the next one, or im screwed.
IF you can afford to, get a ready made crossover with the cats already installed.
It wont me much more then a set of 2 cats by them selfs. I think i found pipes/with for around 280-$400. I got a good deal on two magnaflow cats, but they normally run a little under $100 a piece.
I never used a used set, but that might not be a bad idea if possible.

 

[Shaolin Crane]

5K in cali, no way, its a simple fix it ticket, so 50 bucks and you're good to go, but your not gonna pass smog without cats, been their tried that, but 2 cats are plenty to pass here in cali

 

[Darkwriter77]

When I got my car it had straight pipes with an H off the headers.
I tryed to get a pair welded in and ran into problems.
The biggest one was, there was no room.
The regular straight cats from magnaflow wouldnt clear the frame/floor boards.
By the collectors was tight, and by the drive shaft it would have rubbed on the floor.
There are angled ones that MAY fit by the collectors, but you really have to check for fitment.

These cars originally came with > 4 < cats, so two small ones will not be enough to pass emissions.
Two large ones can work, but need to be broke in some before the tests. (Brought up to full temp, and ran for at least 10 miles/minutes a few times, and before the test.
Mine had its conveters in for all of 20 minutes when i went for the test here in Ohio, and it showed 10 times the junk what they wanted to pass. I have a year to get it ready for the next one, or im screwed.
IF you can afford to, get a ready made crossover with the cats already installed.
It wont me much more then a set of 2 cats by them selfs. I think i found pipes/with for around 280-$400. I got a good deal on two magnaflow cats, but they normally run a little under $100 a piece.
I never used a used set, but that might not be a bad idea if possible.

Incorrect. Many aftermarket cat'ed X- and H-pipes only have TWO cats and some of them are 50-state legal. Even though it fits like total crap (hangs too low, no transmission crossmember hangers, cats welded in about 2" too far back from factory), my UPR X-pipe passes the sniffer test here in AZ with excellent numbers every year, even before I added the smog pump tube to it. So, as far as performance, two cats CAN pass the sniffer test.

However, in super Smog Nazi states like Kaliforniastan, they will probably fail on visual inspection if you have 2 cats welded onto an off-road crossover pipe because they're not part of a CARB-approved setup and they can be anal about the NUMBER of cats to pass visual. I believe CatCo sells an H-pipe with two high-flow cats that is 50-state legal and CARB-approved, but not sure about other brands ... maybe Walker and Magnaflow...

 

[tacomatrx450f]

yea they are nazi's about it, they wouldnt run my trucks smog test because i modified the "air filter" my mustang right now has no smog pump or converters and it would "magically pass smog" but now that i hear that if i am pulled over without the smog system they can have it towed... someone correct me if im wrong

 

[pudman]

+1 on the visual info darkwriter77. I gutted the front 2 and just run the 2 in back with no problems. The new Naziism here in So. Cal is random smog checks setup on the roadside and some sort of "radar sensor" usually setup on freeway on ramps. Can't quite figure out how that works

 

[Shaolin Crane]

+1 on the visual info darkwriter77. I gutted the front 2 and just run the 2 in back with no problems. The new Naziism here in So. Cal is random smog checks setup on the roadside and some sort of "radar sensor" usually setup on freeway on ramps. Can't quite figure out how that works

its a carbon sensor, they have them setup on freeway offramps, when you drive by them if your car has too much carbon output they sensor sets off a light and a cop down the end of the on-ramp will pull you over, when im in my truck i love to stomp on it when i pass them and watch the smoke cover the little sensors and watch the lights go off

 

[Darkwriter77]

its a carbon sensor, they have them setup on freeway offramps, when you drive by them if your car has too much carbon output they sensor sets off a light and a cop down the end of the on-ramp will pull you over, when im in my truck i love to stomp on it when i pass them and watch the smoke cover the little sensors and watch the lights go off

That's just too Orwellian for me to even want to consider reality. Damn, I'm glad I don't live in CA...

 

[Shaolin Crane]

That's just too Orwellian for me to even want to consider reality. Damn, I'm glad I don't live in CA...

sad i know, i wasnt gonna be a sheriff i would have moved to prescott or glendale with the rest of the family

 

[v8only]

the one and only california state legal 2 catted h pipe is the magnaflow unit, that's it.

YOu can't weld cat's into that piece, as it's not the oem pipes and the entire unit hasn't been carb certified.

your only option if you want to be 100% legal is to pick up the magnaflow unit or borrow a friends stock h pipe, or pick up one...they go for about $50 in the classifieds