6.7L Cummins Forum

I have heard that the tuners that offer such an increase in power are really bad on the transmission and we should stick away from them. Looking for a little more power from my 2011 Cummins and was thinking of doing Intake, Exhaust, and a Tuner.

Are the stock transmissions already pushed to their limits with the power that a stock motor is putting out.

Any help would be great thanks.

The answer to your question about the transmission holding up totally depends on your driving style. As a general rule, the maximum additional horsepower that a stock automatic transmission will handle is about 100. With that said, I know guys who are running over 100 constantly and occasionally dial in up to 170 with no problems. But they are easy drivers, starting off slow and gradually build speed when towing, no Jack Rabbit starts when empty, no burnouts etc. I know other guys who are running 50ish extra horsepower and are having transmission problems. You have to decide how far to push it based on your driving style. You must also shorten the service intervals to get long life.
As far as the exhaust goes, there is very little if anything to gain unless you are going to delete the DPF. With the DPF in place it pretty much comes down to looks.
The biggest bang for the buck is probably on the intake side. I gained about 4 mpg and some throttle response when pulling and passing, by gutting the air intake tube, cutting a 4" hole in the bottom of the stock air box and unplugging the EGR.
I tried 3 different drop in air filters. None made any difference in mileage or horsepower, that I could tell. All of them were touchy on fitment and none filtered as well as the Cummins filter. So I am running the Cummins again. If I do anything else with the intake side, it will be to install an S&B intake with the scoop option. The Volant would be my second choice, only because of the cost.
I hope that this helps. It's JMHO though.

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2007 Ram 2500 QC 4x4 SLT TRX4-Offroad 6.7L Automatic. '08 Jeep WK 3.0L diesel-wife's DD.
1998 Jeep ZJ 4.0L Automatic Selectrac-project for our son. '98 Jeep XJ-my wife's former DD.
1965 Dodge Polara 880 Convertible 383 Automatic.

My brother-in-law who is a mechanic in the panhandle of Texas told me to not mess w/ turners (to increase horse pwr and try to save fuel) because in the long run you have a good chance of shortening the lifespan of the turbo.

I bought the Edge Juice with Attitude and if I had it to do again I'd just get the Edge insight for the gauges and the ability to easily read and erase codes.

I never have used any setting other then stock and I can't foresee ever towing anything heavy enough to ever need anything else but stock. My answer, programmers for most of us are just bling and not worth the $$.


I put the Volant intake on for the Nano Fiber filtering and unless you rip out the whole exhaust including the DPF you won't get much from the DPF back system.

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10

I have the smarty jr and I'm dpf deleted with the egr unplugged and the truck is unbelievable. My mpg increased almost 20% and run the 100hp tune all the time without any issues. The smarty tuners claim their power is made safely and will not damage the engine or trans. I agree with DWRDodge6.7 because it really depends on your driving habits.