I'd personally go with JDM. 5 Star is another popular option but I think driveability is better with JDM. They both use SCT tuners which seem to be the best option for the GEN1.
Very pleased with my 5-star tune that I run on my 2012 SCREW.
A couple of notes: I run the 85 octane performance tune for daily use. The fuel efficient and daily/street tunes didn’t do anything for me. What I really appreciate about the performance tune is the improved throttle response and the more aggressive shift patterns. That said, I definitely pay for it at the pump. Average MPGs is only 12.7 for mixed highway and street driving.
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