LEXBOGGY

I'm getting a Apexi AFAC next week and wanted to know if anyone else has done what I'm about to do. I already have removed all resonators from my car and put in a X-pipe and two freeflowing 2.50 inch tubingfrom x-pipe back. I have also put in a injen intake. I will be buying a torque converter after the begaining of the year. Can somone give the best Gain I may get from my mods without NOS?