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New Years

Shop All New Year Deals

Featured New Year Deals

Fuel Filter Conversion Kit for 2011-2025 Ford Powerstroke 6.7L

SKU: SD-FF-6.7P-11

CAT Fuel Filter Adapter for 01-16 Duramax 6.6

SKU: SD-CAT-DMAX

Dual Wall Exhaust Tip W/ Angle Cut 4" to 6" Black

SKU: SD-ETAC46B

Blue Spring Kit with Adjustable Billet Spring Housing for 2003-2007 Ford Powerstroke

SKU: SD-FUELBLK-6.0-ADJ

Cold Side Charge Pipe for 2011-2016 Ford Powerstroke 6.7L

SKU: SD-INTRPIPE-6.7P-COLD-11

Cold Air Intake for 1999.5-2003 Ford Powerstroke 7.3L

SKU: SD-CAI-7.3

Oil Filter & Coolant Filtration System for 2003-2007 Ford Powerstroke 6.0L

SKU: SD-EOF-CF-6.0

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Intercooler Pipes

Frequently Asked Questions

When does the New Year sale end?

Our main New Year promotion runs through the posted end date on this page. Any changes or extensions will be updated here.

Are discounts automatic or do I need a code?

New Years Sale requires you to use "2026"

Can I stack coupons with New Year pricing?

Coupon stacking is not permitted during sitewide New Year promotions unless specifically noted. One promo per order.

Are Clearance or Doorbuster items returnable?

Doorbusters and Closeout/Clearance items are final sale unless defective. Standard items follow our normal return policy.

How long will shipping take during the New Year rush?

Due to carrier volume, shipping times may be longer than usual. In-stock items typically ship within 1–3 business days.

Copyright 2026 Sinister Mfg. Company, Inc.. Not responsible for errors or omissions anywhere on this website . Sinister Diesel reserves right to modify, change or cancel any offer before, during and/or after any sale or transaction. Sinister Diesel ®. Copyright 2021.Sinister Diesel ®, Sinister ®, Sinister Blue ®, the color blue, Master Solution ®, Basic Solution ®, Complete Solution ®, American Born and Bred ®, Unleash Your Truck ®, Pitbull Series ®, Undelete Kit ®, Undelete Your Truck ®, Undelete My Truck ®, the Sinister Diesel logo, Spooled Up ® and all related names, product, designs and slogans, service marks, trade names, and trade dress, whether registered or unregistered that appear on this Website are proprietary to Sinister Diesel its affiliates, its licensors or their respective owners. All Rights Reserved.