Just got an 07 crew cab 4X and my first goal is to be solidly in the 13's. I have a MBRP dpf back exhaust and Quadzilla Stealth on the way, but I'm guessing with the stock cat and DPF mid 14's at best with this combo. I'd much prefer to have the no-smoke and smell that the DPF gets you, plus keeping it legal in California.

I was wondering if anyone is running 13's on the new trucks with the DPF still in place. If not, will removing that but keeping the cat (or whatever it's called on diesels) get me over the hump?

Thanks for your time.

Jody