GoldDog44

That one has been replaced.

Not audible at idle. You can clearly hear it as soon as there is exhaust pressure.

The intake side has been full gone through. 2 charge coolers and everything checked with soap water.

I have 2 2014 CHUs with MP8s. Both deleted. Right after the EGR delete both lost boost pressure and they are short on power. There is what seems to be an exhaust leak whistle on both and the turbos are sluggish. Can’t get more that 31 psi. There is no black soot trail that would point out the exhaust leak. Does anyone know if there is a way to back pressurize the exhaust through the turbo to find any leaks? Has it been done before? I changed both exhaust manifolds to remedy the issue and still no dice. I’m thinking it’s the EGR blocker plate but like I said there is no sign of soot anywhere.

I have mine deleted and I have an Ag Diesel Tuning box hooked up to the ECM. Seems to work good. I can switch between stock and 3 stages of power.

I run a 2014 CHU613 MP8 505 with mDrive. I have over 1.1 million on it and it's still running strong.

Those 11.7 litre engines did well except in the heavy haul department. With 140,000 lbs up here they were ok if you respected the engine for the small block it is otherwise with rookies we would have issues with injectors popping.

With 80,000 lbs you should be fine. The engine is basically the same size as a C12.

Might want to check for leaks on the whole canister and flex pipes. I've had similar issues and had to replace the whole lower canister. Wouldn't throw codes just request parked regen.

if you're gonna run anywhere between 80,000 to 105,500 you can expect 5-5.5 US mpg at least. Local running might be a tad lower and I'd be careful if you're gonna pull anything over 90,000lbs. The engine will be your weak point. We have injector issues with heavier loads here in Canada. Be respectful with it and you should be fine.

SPN 4094 signifies that Nox limits are exceeded due to insufficient diesel exhaust fluid or poor DEF quality.

Given the age of your truck I would recommend checking the lower canister for leaks or cracks. I've done a '13 and a '14 already and it had the same symptoms of always needing a regen.

Glad to be of service. Sent from my iPhone using Tapatalk

I guess I can’t help you then. The design spec said that it’s engineered for 2050 tq as well which would make available even on a Titan or Superliner.

When I bought my truck it had a 445 MP8 with an mDrive and S38R rears. I wanted it bumped up to 505 and 1860. The dealer sent in the request and it was approved however the ECM in the 2014 CHU613 was to old for the 1860 so I ended up with 505 and 1760 which is still sufficient. No issues getting it done.