Paccar PX-9

Tuning Details

The 8.9-liter PACCAR PX-9 engine has one of the highest power-to-weight ratios in its class, with heavy-duty features like replaceable wet liners, roller cam followers, bypass oil filtration and targeted piston-cooling. Available in both medium and heavy-duty configurations this engine delivers the durability and efficiency needed to lower operating expenses, reduce maintenance and increase productivity.

Before
380
HP
After
456
HP
Gain
+
76
HP
Note: Tuning outcomes may vary based on a variety of factors.
Mario High Performance Diesel

Cost Comparison Calculator

You work hard for your money. We get it. That's why we provide ongoing customer support for all of our tunes. Use the calculator below to see how much you could save with a tune from Mario High Performance Diesel.
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Why Mario High Performance Diesel

Real programmers write and create custom tunes

Battle-tested reliability

MHPD tunes operate with unparalleled uptime and help your engine last longer by mapping to spec and staying within your engine's limits. Last longer, tow stronger with an MHPD custom tune.

Cutting-edge optimization

Individual, custom decoding for every tune — no program-merging, swap-overs, or cheap auto calibrations. Mario and his team attend global conferences to stay on top of the latest industry shifts.

Minimal downtime

We schedule jobs to ensure minimal downtime for your truck. Whether remote or in-shop, we'll ensure that your truck is tuned exactly how to you want it with most turnarounds times within same-day service.

Top-notch customer support

Available toll-free daily, MHPD customer service ensures all customers receive follow-up support when they need it. Bring us questions about previous defective programming. We're here to help.

Talk to a tech

There's no better time than right now to start saving money. We're here to answer your questions.

1-855-660-MHPD