These systems usually go over 3grand to replace and fix, just to start over again after another few hundred thou klics.
They are a pain in the arse so to speak, so most of the guys I know that ACTUALLY need these types of truck, go for a bypassed kit as linked to above, to avoid down time and get better HP.
The actual trouble shooting is pretty straight forward, replace EVERYTHING.
Doing a delete will give a more aggressive truck, so neighbours be ware. But in the long run, from limited stuff I know, the guys like the trucks more, but yeah, they get louder, but nothing a weld on muffler wont fix.
The filters clog up all the time, guys get reduced power etc, not a fun situation when you are towing a load, and need to get paid etc.
so when the dpfe (uree) systems goes out, sometimes the guys cant even start the truck cuz they went way passed the life expectancy of the system, and now you have a 100 000$ truck as a paperweight.
However, if OP is in a state or province that actually checks emissions, could be a problem. If it is only a farm truck, or mine truck, who gives a hoot bout that. But if in nazi calif

you might want to spend for the stock kit. Just sayin.
If I did not clarify, tell me, and I will post some links to videos, on how these systems work, and how horrible they actually are in the real world.
Looks good on paper, but up here in the north, nightmare.
Speaking of control nazi,
screen shot of why I pity the usa
