BMS is the best bet for piggyback solution. Especially with the new JB4 for N63 coming out.
The only viable flash tune option is with Eurocharged but there's no reviews on them yet (companies like Mission aren't spending time for the N63)
Dinan would obviously be very safe but also has a very poor hp/money factor compared to something like BMS. A lot of us have run the old S2 from BMS for a long time and have had no issues.
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