2017-2023 L5P All in One Kit (DIY Kit) | GM Duramax

🔥 L5P All-in-One Kit | 6.6L GM Duramax (2017–2023)

Everything you need to wake up your L5P Duramax — tuning, exhaust, EGR delete, coolant reroute, gaskets, and CAN bus plugs, all in one shot. No shop visits, no waiting around. Flash it all yourself from the comfort of your own garage with either HP Tuners (MPVI) or EZ LYNK AutoAgent.

📨 Heads up: Right after you order, you'll get an automated email with everything we need — vehicle details, tuning requests, the works. It's all handled through email, quick and easy.

📦 What's In The Box

• MPVI4 or EZ LYNK 3.0 — your call (if selected)
• E41 HP Tuners Unlock Cable (if selected — 17-18 L5P running HP Tuners only; not needed for EZ LYNK setups)
• 3.5" L5P Downpipe with heat wrap included — 409 Stainless, built to take the heat
• 4" Race Pipe OR step up to a 4"/5" Full Exhaust System — 409 Stainless
• 0–220 HP Custom Engine Tuning (SOTF or Single Tune — your choice)
• EGR Solution — clean it up and keep it reliable
• Coolant Reroute — because factory routing isn't doing you any favors
• Gasket Kit — everything sealed up right
• CAN Bus Plugs — plug and play, no headaches

📚 Your Tune File Library

Every kit includes a full library of custom tune files to choose from, with power levels ranging from stock to +220 HP and custom calibrations built for your specific truck and build. Pick your preferred tuning style:

• Switch-on-the-fly (SOTF) tuning files — change power levels instantly while driving, no need to pull over and reflash
• Single tuning file — one dedicated calibration loaded and ready to go

Every file is custom-calibrated for your specific truck, engine, and modifications — not a generic off-the-shelf tune.

🔓 Free Retunes + Lifetime Support

Yeah, you read that right. Free retunes and lifetime support are baked right into this package. No hidden fees, no upsells down the road. We've got your back for the long haul.

⚠️ The Fine Print (Read This)

• Transmission tuning is sold separately — but we'll point you in the right direction
• No ECM swap required — this is a full DIY flash setup
• Flash everything yourself at home with MPVI or EZ LYNK
• Bringing your own device? Make sure it's an MPVI 2/3/4 or an Auto Agent EZ LYNK 3.0/2.0 — anything else won't work

🔧 HP Tuners (MPVI3 / MPVI4) — What You Need

• If your ECM isn't already unlocked (2017–2018 models), you'll need the E41 Unlock Cable — grab it in the options above
• You'll also need 8 Universal Credits to flash your ECM — buy those directly through HP Tuners once you're connected to your truck

⚡ EZ LYNK 3.0 — What You Need

• No E41 unlock cable needed — EZ LYNK handles the unlocking and flashing automatically, straight out of the box
• If you're running a 2019+ truck, this is the easiest and fastest route — no question

🏁 Transmission Tuning (Sold Separately)

T87A Transmission Control Modules (2017–2019):

• No need to pull your TCM and mail it in — both platforms can unlock it remotely
• HP Tuners: Unlocks via the latest beta version (credits required)
• EZ LYNK: Also unlocks remotely with zero credits needed

T93 Transmission Control Modules (2020–2023):

• Both HP Tuners and EZ LYNK can unlock these remotely — again, no need to send anything in
• EZ LYNK 3.0: Unlock and tuning, no credits required
• HP Tuners (MPVI3/MPVI4): Unlock and tuning, credits required

✅ Fitment

• Engine: 6.6L Duramax L5P Diesel
• Years: 2017–2023
• Trucks: Chevrolet Silverado HD / GMC Sierra HD

🚚 Shipping & Support

We ship within the US. Got questions before you pull the trigger? Hit us up — email slabindustriesdiesel@gmail.com or text (512) 522-9403 and we'll make sure this kit is the right fit for your build.