Core PCM

[sierra1500]

Would it be worth my money to keep my factory PCM or should I just send it back and get my $100 back once I get the new on on and installed?

[Denaliano]

Always good to have a spare :imo

[sierra1500]

That's what I was thinking too. Could you tell an imediate difference with the tune once you got it in?

[Denaliano]

YES and it only gets better as it learns your driving habits. So beat the piss outta it :D

[sierra1500]

Was it difficult to install?

[justinp95]

Its a PITA on my 8.1, but i dont remember it being that bad on my 6.0. Just unscrew and pull out type of thing.

[wyatt_450]

I kept my stock one, and it took all of 2 min. to install on my 5.3.