I'm trying to sort through tuning options for the BOSS kit now, before I commit to ordering one. It's not an easy decision.
I know UM is highly regarded here, but the nearest dealer to me is 2.5 hours away, and I don't like the idea of needing to make that drive any time I need an adjustment. I'm also not sure how reputable the shop really is; I can't find much in the way of reviews or experiences online. I am very curious about the Haldex tune UM has in the works.
I'm currently running GIAC software. It's been great, but they have been "working" on BOSS support for awhile now. I'm not holding my breath for this any longer.
I love COBB accessports, I had one on my STI. I'm waiting until they release their DSG support before making any decisions here. I also haven't seen any official indication they are working on MPI support. We have some good COBB tuners for this platform: Stratified, 5150
Eurodyne checks off all the right boxes: custom tunes with flash from home, MPI support, user logging. I'm hesitant to try their DSG tune after reading of all the issues people have with the different revisions. This is the only platform that allows user tweaks right now.
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