Pick the auto, it's better all round. Mines an auto with intake & exhaust mods. Same auto box as the IS350 so no problem even if you do succeed to raise the power with an S/C. Good luck on a remap, as far as I know the 250 ECU is hack proof.
Cheers mate yes I have been told this, no chipping or remapping is possible!
What upgrades can be made to increase the BHP, does anyone know?