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Nothing special about stage 2. Stock plug gap of 0.030" is just fine. As long as you have good clean sparkers and healthy coils (Eldor brand preferred but new Delphis would work just fine) you will be good.
EDIT- sorry, just realized you have a 550 (N63). I meant the above for the N55s. I hope someone with N63 knowledge can chime in and make a recommendation!!
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11' M-sport- 371WHP - 478WTQ on stock PWG E50 TunedbyShoup // 386WHP - 429WTQ on Shuenk N55+ with ultra-conservative 91 Octane tune // Starting full-range flexfuel tuning in Spring '24
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