C15 low power

You don’t sound too enthused at all man. Sorry to hear that. You didn’t get boost or power back?
You don’t need to haul a load to see if it’s fixed. You should be able to pull full boost at lower rpm in higher gear. It either runs like a raped ape and pulling boost or its running like crap or still the same pretty much

 

I don't know much about those yellow things but 650 seems low on the pyro still. Stock our E-7s won't get above 850 but throw some fuel to them and you'll see 1000+

You said it has a tune also, 650 seems low to me. Pulling a full load up hill even lugging it a bit all you see is 650?

 

And the low NOX file I'm betting is in it

 

Any cat dealers near you? At this point just go haul a load and see how she runs to be sure

 

Pull a load first like initially wanted to do. See what it does

 

Where are you located?