Diesel Performance Parts & Tuning
Diesel Performance Parts Built For Real Trucks
Shop tuning, emissions solutions, diagnostics, turbo upgrades, fuel system parts, and performance accessories for Cummins, Duramax, and Powerstroke trucks.
Browse Products
Shop By Category
Find the right diesel performance products for your truck.
Professional Solutions
Our Services
Professional solutions for every need.
Real Results
See the difference Top Secret Garage can make.
Example results — actual gains vary by vehicle, hardware and fuel.
Before
After Top Secret TuneWe Work With The Best
The platforms we tune and the tools we use to do it.
VW TDI
Caterpillar
International
EZ LYNK
Autel
Autotuner
Alientech
Magic Motorsport
Kess3
HP Tuners
EFILive
Mopar
Banks
VW TDI
Caterpillar
International
EZ LYNK
Autel
Autotuner
Alientech
Magic Motorsport
Kess3
HP Tuners
EFILive
Mopar
Banks
Why Buy From Us
Why Choose Top Secret Garage?
The equipment, experience and support that sets us apart.
Same Day Files
Most files delivered within 24h.
Dealer Level
Equipment and software.
Dyno Tested
Real world proven results.
Remote Support
Expert help when you need it.
Worldwide
Customers in 90+ countries.
Custom Calibration
Tailored to your needs.
Heavy Duty Experts
Diesel & industrial specialists.
Off Road Experts
Built for extreme conditions.
Customer Reviews
What Our Customers Say
Trusted by hundreds of vehicle owners for professional tuning and exceptional service.
"Very quick response and extremely friendly. Great service."
"Very professional and punctual. Communication was excellent."
"Great communication and fair pricing. Exactly what was described."
"Very punctual and professional. Everything was explained clearly."
"Excellent communication and fast service. Highly recommended."
"Very good communication and professional work."
Questions & Answers
Frequently Asked Questions
Find answers to common questions about our tuning services, hardware, and support.
Ready To Unlock Your Vehicle's Potential?
Let's Build Something Fast Together.
Whether it's more power, better efficiency or solving a problem, we have the solution.