Supreme Diesel Performance & Injection
Custom diesel calibration & parts
Built for trucks
that work.
SDPI builds one-truck-at-a-time calibrations and stocks the hard parts to back them up — from Power Stroke, Duramax and Cummins pickups to on-highway and equipment diesels.
- Tuning platforms supported
- 7+
- Tuning platforms supported
- Parts & kits in the catalog
- 200+
- Parts & kits in the catalog
- Revisions included with every tune
- 3
- Revisions included with every tune
- Every calibration built per truck
- 1:1
- Every calibration built per truck
Calibration support across every major platform
Hear it run
This is what an SDPI calibration sounds like.
Braxton's own truck on an SDPI file. Turn the sound on — the throttle response and turbo spool tell the story better than any spec sheet.
The good stuff
Featured parts
Custom tuning
How it works
Pick your platform
Choose your truck and tuning device — HP Tuners, EZ Lynk, EFI Live, Calterm and more.
Tell us about the truck
VIN, calibration number, mods and goals through a guided questionnaire. Upload your read file if your platform needs one.
We build your calibration
Every file is built one truck at a time — no generic canned files.
Download from your account
Your tune is delivered securely to your SDPI account, with revisions included.
Why SDPI
Tuned by someone who has actually wrenched on these trucks.
SDPI is run by Braxton Gravett — a diesel tech turned calibrator who has built, broken and fixed the platforms he tunes. That hands-on background is why SDPI calibrations get matched to your hard parts, your fuel system and how you actually use the truck, instead of a one-size-fits-all file.
Per-truck calibrations
Every file is built against your VIN, calibration number and mod list.
Revisions included
Tune orders include revisions inside the revision window — dial it in until it's right.
Secure delivery
Files are delivered through your SDPI account, not lost in an email thread.
Straight answers
Ask before you buy — if a combo won't work, we'll tell you.
Ready to wake your truck up?
Browse the catalog, or reach out and tell us what you're building — we'll point you at the right combo.