spec 3 is the way I went and after its finally been broken in I really like it. Chatter is gone and it bites hard. Dont know about the others but I'm happy with mine. good luck
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97 T/A Ram Air Convt
Forever dyno queen / 777rwhp 662 rwtq @ 17lbs / 10.2 @ 140
'24 Corvette Z06
17 Sierra 2500HD Dmax
81 Turbo TA
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