• Diesel Modules performance module, harness and Low/Medium/High switch for 5.9L Cummins Medium-Duty RV 1998-2003
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PSI

5.9L Cummins Medium Duty RV (1998-2003) #12300 - 50/105

5.9L Cummins Medium Duty RV (1998-2003) #12300 - 50/105

$895.00 USD
$1,100.00 USD $895.00 USD
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Fitment & details

Fits: 

1998-2003 L6-5.9L (td) medium duty RV

 

PERFORMANCE MODULE BENEFITS

Simple Install: Plug-N-Drive installation with OEM-style wire harnesses and factory-style connectors.

Fuel Mileage: Designed to deliver up to 20% improved fuel economy (2-4 MPG average improvement)

Power Increase: Functional (Driving-zone) horsepower and torque of up to 25%

Dead Pedal: Significantly improves throttle response and reduces/eliminates dead pedal.

Turbo-lag: Significantly reduces turbo-lag for safer, more responsive on-demand performance.

Engine/Powertrain: Our modules are designed to work with (stock diesel engines and powertrains) never deleting or modifying stock setting.

Proven over 20 years: Self-installed in tens of thousands of diesel pickups since 2003.

No Additional Mods: No need to modify your stock intake, turbo, or exhaust, and no need to add gauges.

Don’t be fooled! There are a lot of performance products out there that make your engine do something it shouldn’t do…Our performance modules allow your engine to do what is truly capable of, with no changes to stock settings. Instead of being frustrated with your diesel’s poor mileage, dead pedal, and turbo lag, simply upgrade it with our warranty-friendly performance module today–and get the mileage increase and low-end performance gains you deserve!

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  • OEM-style harness

  • Up to 20% economy

  • Driving-zone power

  • Less turbo-lag

  • OEM-style harness

  • Up to 20% economy

  • Driving-zone power

  • Less turbo-lag

Stock diesel engine's warranty-friendly best friend.

The module is designed to work safely with stock diesel engines and powertrains. Factory settings stay intact with no footprint on the ECM.

18 shield check

Factory settings stay

Designed never to delete or rewrite factory calibrations or equipment.

12 box

No other modifications needed

No intake, turbo, or exhaust changes. No gauges to add. The module is the upgrade.

Stock vs module

Keep the factory settings. Change how they respond.

Factory engine detuning robs you of driving-zone HP, mileage, and throttle response. Our warranty-friendly performance module targets the driving-zone to deliver accessible power, torque and mileage gains, while the ECM stays untouched.

Module upgrade

Stock diesel

Install path
Plug-N-Drive OEM-style harness
Factory as delivered
Fuel economy
Designed for up to 20% mileage gain
Factory mileage
Throttle feel
Sharper response, less dead pedal
Stock dead pedal
Turbo response
Reduced turbo-lag on demand
Factory lag
ECM settings unmodified

The pedal finally matches the horsepower

Owners praise the throttle response they use every day

4.8

/ 5

What stock diesel owners are saying

Hood work, then highway

I put it on my 2019 L5P in the driveway after work. Connectors clicked like factory. Next morning the throttle actually showed up when I merged. Still stock under the hood besides the module. Took me longer to take it out of the box than to install it. I put it on my 2019 L5P in the driveway after work. Connectors clicked like factory. Next morning the throttle actually showed up when I merged. Still stock under the hood besides the module. Took me longer to take it... I put it on my 2019 L5P in the driveway after work. Connectors clicked like factory. Next morning the throttle actually showed up when I merged. Still stock under the hood besides the module. Took me longer to take it out of the box than to install it.

Mark E.

Dead pedal is gone

Had the truck 3 years and hated that empty first inch of pedal and bad mileage. After a week with this, city driving feels normal again. Turbo really kicks in sooner, and i'm up 3.5 mpg's. Wish i did it a long time ago. Had the truck 3 years and hated that empty first inch of pedal and bad mileage. After a week with this, city driving feels normal again. Turbo really kicks in sooner, and i'm up 3.5 mpg's. Wish i did it... Had the truck 3 years and hated that empty first inch of pedal and bad mileage. After a week with this, city driving feels normal again. Turbo really kicks in sooner, and i'm up 3.5 mpg's. Wish i did it a long time ago.

Andre S.

Tow days feel calmer

I haul a small trailer on weekends. Used to wait on the turbo, then it would dump in. Now the truck fills in earlier so I am not stabbing it. Mileage on mixed weeks looks better than last summer. Not magic, just less lag and less waiting. I haul a small trailer on weekends. Used to wait on the turbo, then it would dump in. Now the truck fills in earlier so I am not stabbing it. Mileage on mixed weeks looks better than last summer. Not... I haul a small trailer on weekends. Used to wait on the turbo, then it would dump in. Now the truck fills in earlier so I am not stabbing it. Mileage on mixed weeks looks better than last summer. Not magic, just less lag and less waiting.

Elliott W.

Left the ECM alone

I wanted more response without flashing anything. Installed it under the hood, drove it to work, and the truck still feels like my Duramax. Just sharper when I ask. That was the whole point for me. I wanted more response without flashing anything. Installed it under the hood, drove it to work, and the truck still feels like my Duramax. Just sharper when I ask. That was the whole point for me. I wanted more response without flashing anything. Installed it under the hood, drove it to work, and the truck still feels like my Duramax. Just sharper when I ask. That was the whole point for me.

Beth R.

Daily commute, less lag

On-ramp is where I notice it. Pedal used to sit there, then the turbo would catch. Now it comes on when I need it. Simple install, no extra gauges, and I have not touched intake or exhaust. Four months in and I still look forward to the drive home. On-ramp is where I notice it. Pedal used to sit there, then the turbo would catch. Now it comes on when I need it. Simple install, no extra gauges, and I have not touched intake or exhaust. Four months in... On-ramp is where I notice it. Pedal used to sit there, then the turbo would catch. Now it comes on when I need it. Simple install, no extra gauges, and I have not touched intake or exhaust. Four months in and I still look forward to the drive home.

Noel G.