First off, I bought this tune, with my own $$$, so take note this is not some hidden sponsored blog post. I ordered the Stage 1 tune, and had the software and first revision of the tune within a few days. They do ask for all your modifications so they can prepare the tune as the cable is getting shipped out. You log into their online portal, download their software and download your first tune. With the OBDII cable provided, you connected it to the OBDII port and your PC. Getting the PC and OBDII to connect can be a little fussy some times. If you are a computer nerd such as myself take note that using a USB over serial type connection like this cables can require a reboot of the PC when things to don't work. So for laptop users that just leave their computer in standby mode, reboot and then connect everything to reduce connection errors. That said, you first "Read the ECU" to save a copy of your current ECU setup. As I didn't know what I was running, I really didn't care about that, but did it anyway. After that, to Write to the ECU you locate your tune file that your previously download and get ready to write. You will get warning that it is best to have a charger connected to your battery. I risked it and didn't do that, but I turned off all lights, radio, AC/blower, etc so there was little to no draw. The writing process takes about 5-10 mins from start to finish. Once it was done I disconnected and then connected vcds to do a throttle body adaption. This was not requested by Motoza, but I did it anyway as many forum members recommended it after loading any kind of tune or resetting the ECU. After that I went for a drive for about 20-30 mins to get the S4 nice and warmed up. After it was warm you enable logging via their same software with your laptop and the supplied OBDII cable. They recommend to log for 15+ min to get a good sense of how the car is doing. Do a couple of WOT runs, cruise on the highway, and some city driving. After the logging, you upload the log files to the same online portal. 24-48hrs later they review the logs and provide a new tune revision if one is needed. When I got my second revision, I did the same thing write, log, and report my experience. Currently I'm waiting on my last revision as we are going to bump up the boost a little more. Currently we are peaking at 20psi at WOT so I'm interest to see what this 3rd tune will feel like. They have been very clear that doing this little extra with the boost is likely going to reduce the life of the turbos. If the k03 die, I guess I'm forced to upgrade. Oh darn.

How does this tune feel?
Simply great! I drove from Seattle to Leavenworth, WA and back and had a 27mpg average while doing 65+ mph pull most of the way. My S4 pulls hard for being on KO3... harder than it ever has. Keep in mind that I have APR tune and a MTM tune, all I can say is this Motoza tune is heads and tails better than any of the others. Which is not shocking as must S4 owners will say custom tunes are always going to be better than "tune templates" like what is offer by GIAC or APR. The simply fact that is custom to my setup is really bring my S4 back to life. 

Whats Next?
Well Motoza offers a Stage 1+ upgrade, but it requires using 550 CC injectors, but the tune itself is only $40 upgrade. I could do a E85 tune if I wanted, but there is little to no E85 stations around the Seattle area.  So I'm out of luck with that. I think I'll get the 550 CC injectors later this summer and do the Stage 1+ upgrade. This should pump out another 20-40 more HP and 10-20 ft-lb of torque. Nothing huge, but it does prepare me for future K04 or other hybrid turbos. 

In Summary, if you looking for a new tune, or maybe you were in my boat and didn't know what tune you were running, I can't recommend enough about Motoza Performance. The tune is impressive and the service and support and honestly the best I've ever experienced ever in my life. And best yet the price is hard to beat. 

Link: ​http://motozaperformance.com/product-category/software/audi/audi-s4/b5-2-7t/
Price: $349 (as of June 2018)