Straight Talk About Duramax L5P Performance: What We've Learned Working With Diesel Owners Like You

The Reality of Modern Diesel Ownership

We get it, when you're halfway through hauling your fifth-wheel and that regen cycle kicks in it's beyond frustrating. That DEF system warning that always seems to light up before a hunting trip? We have seen it more times than we can count. And don't get us started on how EGR issues can cut an engine's life in half.

After working on thousands of L5P engines from 2017 to 2023 models, here's what we know: These trucks are over-engineered to survive emissions requirements not to maximize your driving experience. The good news? With the right approach you can reclaim that raw diesel performance.

How We Approach L5P Solutions Differently

When we designed our L5P performance kits, we didn't just throw parts in a box. We started with real pain points:

Take our EGR solution - we could've just included block-off plates. Instead, we engineered a complete coolant reroute system because we've seen too many trucks overheat after cheap fixes.

Our delete pipes? They're mandrel-bent because crushed bends rob power. And we include CAN bus plugs because nothing's more annoying than dashboard lights you can't turn off.

We also know tuning is everything. That's why we offer custom made Tuners with custom calibrations we've tested on everything from 2017 work trucks to 2023 pavement queens. Whether you need smooth towing power or maximum off-road performance, we've got a tune that feels right.

What We Tell Customers in Our Shop

If you’ve got a 2017–2019 L5P Duramax, the best way to start is with a full delete kit that removes the EGR, DPF, and DEF systems and adds custom tuning. This all-in-one setup helps your truck breathe better, run cooler and deliver more power with improved fuel economy.

For 2020–2023 models, a complete kit isn’t just recommended — it’s necessary. The newer ECU systems are more locked down, and that’s exactly why the 2020–2023 Duramax delete kit was built: to give you a reliable, performance-ready solution that works.

We also shared the realities: This is strictly for off-road use. Your warranty will be voided. And please - keep all your stock parts organized in the garage. We've helped too many guys who needed to revert their trucks for inspections or trade-ins.

Your Roadmap Based on Model Year

Through trial and error working on hundreds of trucks, we've found what delivers real results:

For 2017-2019 owners, get the L5p All in one deleet kit for 2017-2019. We've seen consistent 3-5 MPG improvements just from the EGR solution and tune. Then add the exhaust components when you're ready.

2020+ owners should consider our 2020-2023 L5P All in one delete kit. The newer emissions systems require more complete solutions - half-measures just cause headaches. The DEF system solution alone prevents countless warning lights.

Why We Stand Behind Our Kits

Last month, a customer drove his 2018 Silverado from Ohio to our shop after his third DEF system failure. We installed our complete L5P delete solution on a Friday and by Monday he was towing his excavator without a single warning light. That's the reliability we engineer into every kit.

We're not some faceless corporation. When you call us at 833-304-4400, you're talking to guys who wrench on these trucks daily. We answer our own phones because we know how frustrating it is to need answers when you're under your rig on a Saturday afternoon.

The Honest Truth About Installation

Can you DIY this? Absolutely we design our kits for skilled owners. But be realistic: It's a 6-10 hour job for most. Those factory exhaust bolts will fight you. The EGR coolant lines require patience.