What if I add another muffler to my car?
A muffler is not an exhaust emission component.
Tester
It would prove that you are not financially responsible and refuse to fix things properly.
HmmmâŠwhat about an aftermarket cat? 
No real point diving down this wormhole. But I couldnât help myself.
What law says that the emissions coming out of the tail pipe cannot be further reduced legally? I find in rather funny that someone would put so much effort in to trying to prevent someone from reducing harmful emissions from their vehicle.
VOLVO-V70 ??? adding a muffler is non financially responsible?
I never said you canât add diesel emission components to a truck that doesnât have it.
I worked in diesel emission research and testing.
And I can state as a fact, that adding a selective catalyst reduction system to a truck that doesnât have it, is going to be far more expensive than buying a truck that already does.
Tester
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I wonder what retrofitting a newer model (6.0 liter truck) exhaust would do as far as the exhaust smell? Or an aftermarket cat?
The real cost (I think) would come with the def systemâŠas I think the regens and other operations are probably computer controlledâŠwhich would require a pcm that never existed be fabricatedâŠ?
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Yes, this right here⊠And would also require, I think, electronic direct injection which cannot be retrofitted to an older mechanical direct injection diesel engine from 1999. That would require a complete engine replacement to a more modern engine AND its complete emissions and electronic control system at great cost.
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Everything in the diesel exhaust emission controls is computer controlled.
The diesel fuel injection for a DOC/DPF regen, and the urea injection into the SCR to eliminate NOx.
Tester
Washington State
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Requirements for vehicle registration in Washington State has absolutely nothing to do with this topic.
Yes
They do
Because what @It_s-Me posted proved conclusively that what you were proposing is considered tampering and is illegal
And weâre back to what I said a few days ago . . .
This truck needs to pass legitimately
or be retired
He didnât miss it he knows it all even when he donât. 
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Doesnât anyone else get irritated with this ridiculous trolling? Theyâve backed down a bit since the attempt to get me banned failed, but still! The conversation has suddenly been derailed in to talking about registering a vehicle in Washington State and passing emissions, neither of which had anything to do with this topic. No State in the US requires an older vehicle to comply with current new vehicle emissions requirements, although there are rules about bringing in a later model year vehicle that was sold in a place with fewer emissions requirements.
Now it could be â and this is just your assumption â that the person is trying to modify their vehicle which was sold outside of California, or a Cali like State, and was not compliant with California emissions, to be California complaint. The person didnât say this though.
Itâs still against Federal law to modify the emission system on a car, even if your modifications improve it.
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But every state has to comply with the Federal statute that expressly prohibits tampering with the factory emissions system. Meaning that if you have a 1999 Ford and install a 2019 Ford exhaust catalyst in addition to the factory emissions system, the truck is tampered. Itâs that simple.
Adding a catalyst is just as bad as removing a catalyst in the eyes of the law.
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That does seem kind of self defeating. I canât imagine an inspector saying âHey! This truck isnât supposed to have a catalytic converter! You must have added that. No sticker for you!â But Iâm not in a state that requires inspections so maybe thatâs a possibility. Iâve also never found an EPA official on a creeper underneath my truck. Interesting discussion as most people probably wouldnât want to spend the money to add a converter anyway.
Do you know of a single case of anyone anywhere in the USA getting in trouble for adding an additional emissions reduction device down stream of the factory compliant one?
Probably not. Most folks donât like spending money on things that they donât have to on their vehicle. Unless itâs fancy rims or a louder exhaust lol.