Aftermarket DOC/DPF

[mikkhh]

I have experiences with cheap aftermarket catalysts on 10-30 year old gasoline cars that get yearly tested for HC and CO emissions from tailpipe readings. Well on most cars you do get check engine for catalyst efficiency faults if you use aftermarket catalysts, emissions you can pass first time after installation, second year usually those catalysts are done and they need to be heated up big time to pass emissions test. Original catalysts on the other hand last long long time some even 10-20 years before emissions failures, usually they get damaged due to engine consuming oil. when cars have gotten old. There are buyers who buy used catalysts to harvest precious metals out of them. Most buyers do not want those aftermarket catalysts for even free. OEM catalysts have still scrap value on some old japanese cars that are 30 years old might have a catalyst that is worth 1000 bucks by catalyst recyclers.

It makes sense to use those cheap (50-100usd) crappy aftermarket catalytic converters on 500-1000 bucks beater cars (and if those crappy catalysts fail you do not pass yearly inspection emissions wise, but can still drive) not on commercial equipment that your income depends on. Some guys just buy aftermarket catalyst and make quick attachment with clamps so they only use them for emissions testing.

How much extra fuel frequent dpf regens cost you? Extra fuel used is money lost and since truck is driving every day costs to add up over a year quite fast.