Red, White & Boosted — 4th of July Diesel Sale

Red, White & Boosted — 4th of July Diesel Sale

Dieselr's Red, White & Boosted sale is liveJuly 1–6, 2026. Take25% offall DIESELR, Chaos, and GDP tune files and10% offDieselr hard parts — calibrated, dyno-proven upgrades for Ford Powerstroke, GM Duramax, and RAM Cummins. The week also brings vendor deals on SunCoast transmissions, Calibrated Power Stealth turbos, Edge CTS3 monitors, and Mopar Cummins ECMs. Retail discounts apply automatically at checkout; dealers see their pricing on sign-in.

Red, White & Boosted

Every deal, one page. Tap any tile to shop.

Dieselr 4th of July sale — 25% off tune files, 10% off Dieselr hard parts, July 1–6Dieselr 4th of July sale — 25% off tune files, 10% off Dieselr hard parts, July 1–6Shop →Calibrated Power Stealth turbos 10% off — July 4 onlyCalibrated Power Stealth turbos 10% off — July 4 onlyShop →SunCoast transmissions 10% off through July 31SunCoast transmissions 10% off through July 31Shop →Randy's Transmissions free shipping + flexplate — call to orderRandy's Transmissions free shipping + flexplate — call to orderShop →Mopar Cummins ECM $2,600 out the door — 2019-2021 6.7L, ideal tunable swap for 2022-2024Mopar Cummins ECM $2,600 out the door — 2019-2021 6.7L, ideal tunable swap for 2022-2024Shop →Free EGT probe with Edge CTS3 — $200 value through Aug 31Free EGT probe with Edge CTS3 — $200 value through Aug 31Shop →

Shop the deals

Shop the Sale

 Dates, discounts, and how each deal works.

FAQ's for the Sale

When does the Red, White & Boosted sale run?

  • The core sale — 25% off tune files and 10% off Dieselr hard parts — runs July 1–6, 2026.
  • A few partner deals run longer: SunCoast transmissions through July 31, the Edge CTS3 + free EGT probe through August 31, and Calibrated Power Stealth turbos on July 4 only.

Do I need a discount code or coupon? 

No — retail discounts apply automatically at checkout.

Do dealers get extra off? 

Yes — an additional 10% on tunes and parts on top of dealer pricing; sign in to see it.

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