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2007gmccrewcab 07-30-2007, 06:44 PM I just ordered the PPE for my LMM today. I still have the stock exhaust on but I want to try out the PPE what level do you think is safe will the stock exhaust? I would say it will be a month before I get the DPF back MBRP stainless exhaust 4". Farmer Dave 07-30-2007, 07:10 PM Depends how hard you drive it. I've been on level 4 since day 2 (about 2 months) not one problem. 07DMAX69 07-30-2007, 11:19 PM how do you drive yours? 2007gmccrewcab 07-31-2007, 12:17 AM I like to stay with the crowd but have enough HP to go fast for a short while. Unit453 07-31-2007, 12:21 AM I'd be much more worried about your tranny vs a $350 dollar exhaust system... DSTRBD 07-31-2007, 12:40 PM The only real way to check is by installing a pyro. These trucks get hot quick because of all the emissions crap. Level 4 will get up there pretty fast, but as long as your not foolish about it, you will be OK. | ||