2 Year Warranty

Showing 1–9 of 18 results

Superior Performance

The premium Advantage 3 provides the best in performance, savings and aftercare for your engine. Optimise your diesel engine with outstanding torque and BHP. Average fuel savings of 12%

Adjustable Tuning

The Tunit Advantage 3 premium model provides easy adjustment 0-9 via an external dial or bespoke fine tune through our national dealer network for maximum results.

Go Eco

Every driver and every car is different. Choose a setting 0-9 from the Advantage 3 external dial. Move higher or lower to improve economy.


Ben, Renault Master 2.5dci

My Renault master 2.5dci has improved by about 3 mpg, when doing 1000 miles a week its a great saving.

Andrew, Fiat Grande Punto 1.4i

I've only had my optimum for a week now but to be honest I can't feel any difference to performance or fuel economy. Maybe I have to drive more for it to adjust to my vehicle. I have been in touch with Tunit and they have A1 5 star customer service. They reply quick and respond very well to the emails. Overall seem like a decent company. Fiat grande punto 1.4 16v NA. Further to my last comments. I've drove about another 150 miles and I can notice an improvement midrange especially can feel more torque now. Good product.