Personally, I just flashed and let the car idle for a 3 or 4 min, then took it out for a spin. Did a few runs from minimal throttle + rpm to max throttle and rpm through the gears and was fine/unnoticeable to me
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Perrin: Crank pulley, 3" Cat back, Nameless: 3" FP/OP
GFB: water and alternator pulleys
Borla: UEL Header
Hyper Black ROTA T2R 18x9.5, DSS CF Shaft for AT
-= OFT - Stage 2 UEL E85 - fine tuned by me. =-