I have a 6.7 and it's bone stock motor an tranny but it came with a bullydog already hooked up. It stays on extreme cuz if i turn it down the tranny acts up. It's thrown a few tranny an Dpf codes. I deleted the codes an it's ran fine ever since. What should I do?

 

How many miles? Have anything done? Like a tbe or deletes?

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If it has a bully **** on it, the dpf is probably clogged. I'd get a 4 or 5" tbe and a egr delete and get a H&S tuner for a programmer