About Doubtless Diesel Performance

Built in the Far North. Tuned for Power, Performance & Adventure.

Doubtless Diesel Performance (DDP) is the Far North’s specialist in servicing, ECU tuning and 4×4 upgrades. Proudly based in Coopers Beach, the business was founded by Arran Marshall and Dylan Anderson, combining years of hands-on experience in diesel repairs, engineering and performance solutions.

At DDP, the focus is on delivering reliability, performance and value. From routine servicing to advanced remapping and purpose-built 4×4 accessories, every solution is designed to meet the real demands of Northland conditions.

Whether you’re towing gear, working the farm, or exploring off-road tracks, you can rely on DDP to Maximize your vehicle’s Performance.

Performance Tuning & Remapping
Precision and Proven ECU tuning, Helps delivering more torque, horsepower, throttle response and fuel efficiency.

Routine & Heavy-Duty Servicing
From WOF pre-checks to wet belt replacements, oil and filter changes, and full-service diagnostics for Hilux, Ranger and other popular diesel platforms.

4×4 Accessories & Fitment
Supply and installation of Safari snorkels, Rock Armor bull bars, Lift kits, Winches, engineered for rugged terrain.

Mobile Onsite Servicing
No workshop nearby? We bring the service to you. From tractors to commercial fleets, our on-site capabilities cover the far reaches of the Far North region.

Why Choose Us

  • Local Expertise: Born and raised in Northland, we know local terrain, so your setups are built for actual conditions.

  • Compliance and Quality: All parts and work meet NZTA’s WOF and COF standards with NZ-approved consumables.

  • Transparent & Fair Pricing: We provide itemised quotes and a loyalty rewards program that earns you points on every booking.

  • Friendly, jargon-free advice: We talk straight, explain all work in plain terms, and check in post-service to ensure satisfaction.

Our Suppliers