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I take some of that back. It looks like there is 3.00" pipe all the way back to the muffler and then the muffler has two smaller pipes coming out. It kind of seems the Y pipe may be a bit restrictive at the bends, not sure.
The Cat doesn't seem that old, but when I drive the truck, it seems restricted and very quiet....like too quiet, makes me think the cat is clogged or something.
Pellet-style catalyst. Moderate chance there's no pellets in it any more. Used to see cars with pellet cats occasionally spitting beads out the tailpipe after they've gone through the exhaust pipe, muffler, and tailpipe.
Illegal--violates FEDERAL law. The only thing you have going for you is that there's little enforcement unless the State or County does it.
Possible. Not popular. Both pipes need to go down the right side to avoid the transfer case and fuel tank. There are dual-exhaust, twin-catalyst systems for certain vehicles/certain engines in GMT400 trucks--but you're locked-out of that as you can legally only put one cat under your truck.
1989 doesn't have rear/downstream O2 sensor(s).
1989, TBI.
Yup. But it's a single catalyst.
It's been so long since cars didn't come with catalysts, that when they're disabled/removed/defective, folks aren't used to the stench.
I am sure it is illegal. I don't have any inspection requirements here. Not saying that it's not illegal, just not governed by the state. O2 sensor is only before the catPellet-style catalyst. Moderate chance there's no pellets in it any more. Used to see cars with pellet cats occasionally spitting beads out the tailpipe after they've gone through the exhaust pipe, muffler, and tailpipe.
The pellet-style cats were restrictive when new. Modern cats are honeycomb/monolithic and not as restrictive.
Illegal--violates FEDERAL law. The only thing you have going for you is that there's little enforcement unless the State or County does it.
It's also going to be a D-I-Y project, no decent shop will touch a catalyst delete as it carries a potential $10,000 fine--and there IS enforcement on that, although it's spotty.
Possible. Not popular. Both pipes need to go down the right side to avoid the transfer case and fuel tank. There are dual-exhaust, twin-catalyst systems for certain vehicles/certain engines in GMT400 trucks--but you're locked-out of that as you can legally only put one cat under your truck.
You might as well cram a high-flow "Y" pipe, high-flow catalyst, and big pipes back to the muffler and tailpipe.
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1989 doesn't have rear/downstream O2 sensor(s).
1989, TBI.
Yup. But it's a single catalyst.
It's been so long since cars didn't come with catalysts, that when they're disabled/removed/defective, folks aren't used to the stench.
