I appreciate everyone's reply regarding their expierences with exhausts.. I live in N.Va and I don't want it to be too loud b/c of cops. I don't want to give them extra attention. Also Va emissions are pain in a butt also, so I would def need 02 sensor.
Jester is in my top list for ECUflush only if it wasn't for Mitsu warranty I would do few more mods but I think I would stop with TBE, and Ecuflash as for performance, but for my cosmetic, I've already ordered Advan RGII, looking into M3 style mirrors, CF front lip, and few other CF parts.