“This is by far the best bang for your buck mod for 10th get Si’s. I absolutely love the Ktuner and the TSP Stage 1 tune. I mostly use map 2 but which is already a huge difference from stock, and map 3 completely wakes the car up. Highly recommend this product and I believe it should be one of every Si owner’s first mods.”
“Two step performance was very helpful and man the Tsp Stage 1 tune really brought joy to my car all over again. Definitely worth it recommend to everyone”
“The Ktuner unit itself is awesome, the construction quality is solid and it looks nice in the car. The interface of the software is also great and has a lot of options and data you can monitor from your recordings.
The TSP tune makes the whole package so much more worth it. Super easy to install and makes the car feel, in my opinion, like it should from the factory.”
