Easy to use, the program for flashing is straight forward and easy to navigate. Plus if you do have a issue, email them, they have a quick response time. Matt is who I was emailing. "Great Service "! Mariano

The TCU tune alone was worth the price. The extra hundred horsepower was just icing on yhe cake! Wish I had done it sooner!

Loaded a stage 1 on my 2015 S4 and am very happy with the results. Keep up the good work Jackal.

Worth every penny!!!

Highly recommend, such a great improvement. Deflap tune runs great

I changed injector types right before i flashed the tune and i had a rough idle before but im not sure whats going on. I doubt the tune caused it.

Easy to install tune, added that extra little bump and now she goes. Now I’m getting ready for stage 2. Added drivability as well as a better shifting feel.

Love it.

I am beyond pleased with the stage 1 tune! Throttle response and drivability are 10x better than stock. Shift logic feels much more natural. The added power is a nice bonus!

Absolutely fantastic tcu trans makes my zf8 shift lightning fast and super smooth and the ecu tune is fantastic car runs phenomenally tons of power and an absolute animal from a dig especially since the a7 weighs 4200lbs it's fantastic so glad I switched over to jackel and Matt is Absolutely ontop of it when it comes to customer response and answering any questions you might have definitely look forward to doing more business with jackel in the future 👍

Updated the B8.5 S4 from stock tune to stage one ECU and TCU for only driven a couple hundred miles currently, but the biggest change is the feel of the transmission shifts and how much smoother they are. The powerband feels great when driving around town and its much easier getting onto the highway too. Would recommend to anyone for a good wake up from stock and look forward to future with the car and what more can come out of it with more updates.

Awesome

Love it just rev limiter to 4k rpms

Easy to do and love the results!

Jackal is awesome. The car is so much faster now on stage 1.