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6.7 Cummins Performance Upgrades

Posted on 22 February 2015

2007.5-2015 6.7L Cummins engines are some of the most reliable ever put in a pickup truck.  Street Diesel Power has brought together the best in the industry for your Ram truck.  From mild to wild, we will get you to your power goal - and save money along the way!

For 400-500hp goals, a tuner, intake and Fass lift pump is all you need.  Most of our customers fall into this category since they use the truck for towing, trips and daily driving.  The stock turbo is responsive at low rpm's and features a built-in exhaust brake.  This turbo can keep EGT's under control until the 500hp mark.  Beyond that, a turbo upgrade is in order.  The 500hp mark is also the limit of the stock transmission.  The overdrive clutches and torque converter are just not strong enough to reliably hold 500+.

500-600hp requires a turbo upgrade and built transmission.  Compound turbos are a great way to keep your exhaust brake for towing, but have massive air flow in the mid and upper RPM range.  These kits also work with the emission components on the vehicle.  For a transmission setup, the truck will require an upgraded converter, tuning/control for more line pressure, upgraded clutches, sprag, pump and valve body.  We also suggest a billet flexplate as the stock unit has been proven to crack over 500hp.  

For power levels over 600hp, aftermarket injectors and CP3 will be needed (in addition to the previous modifications litsed).  The 6.7 Cummins doesn't require extremely aggressive injectors for 600-700hp.  A 75 or 90hp nozzle, twin CP3's and custom tuning can get it in that range.  We recently setup a 2008 6.7 with 90hp nozzles, a compound turbo upgrade, twin CP3's, head studs, Fass 150 and built transmission.  It was consistently making 615-630hp on a Mustang Dyno and peaking EGT's around 1250 degrees.  

Where customers waste money is not having a definite goal in mind before starting modifications.  The parts needed for making 550hp may not be compatible with 650.  Having to go back and change injectors, turbos, or re-doing a transmission setup is not cheap.  We would be happy to talk with you before buying parts, to make sure a plan is in place to not spend money twice.

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  • Tom Walters: June 20, 2016

    Hi, I have a 2012 Cummings stock. I see it looks like a cheap hp boost. What about mileage if you drive it normal? Same?

  • Tom: June 20, 2016

    Hi, I have a 2012 cummins stock. I see it looks like a cheap hp boost. What about mileage if you drive it normal? Same?

  • Street Diesel Power: April 12, 2015

    Thank you for the question! The ATS Atomizer is a great way to pick up 75hp for under $500. The install is easy and power levels can be adjusted in the cab with the dial. It controls rail pressure more aggressively than the factory ECM calibrations. But because it reads boost/MAP signals, it doesn’t have the rattle or surge some pressure boxes do.

  • Lance Esquibel: April 12, 2015

    I have a stock 2012 6.7 high output ram. I bought the truck new and with it being my first diesel pick up. I mainly use it to tow my 15,000 lbs camper and daily driving, but where I live we have mountains and it takes a lot out if the truck to get to the top. I want to increase horse power and torque but under a strict budget. Any help? Thanks in advance

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