I vouch for the guys at @
DeliciousTuning. They have been doing great work with my tune on a C38 JR kit at high elevation. Granted I have done a number of logs, I think that goes to show the amount of attention they put into their work. And as it has been stated above, from the base tune I received to now it has gotten progressively better all across the board. For the price I think you'll be hard pressed to find a better alternative.
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2013 Ultramarine 6MT- Feal 441 coils, Whiteline 20mm front/18mm rear swaybars.
RPF1 17x9 +35. 245/40/17 RS-3 V2.
OFH, Invidia OP, Spencer Fab HFC FP, Invidia N1
C38 JRSC, JROC, Delicious Tune, Radium PCV Catch Can