[Joshua1010]

Hey !
So my story is :

Have a 2012 F11 535XI and i have made some mods which are :
VTT Vargas Turbo Stage 1 upgrade, Supersprint full exhaust with sport cats,
GFB DV+ diverter valve, K&N Sport airfilter, wagner-tuning competition intercooler, BMS charge pipe, ECU reprogramming, Running on 100 octane all the time since i bought it.

And my results are : 370Whp, and 480WTQ on dyno..which is a bit low in my opinion.
In my country that Chiptuner company is the biggest and they have a lot of positive feedback, but i am a bit dissappointed , since when the car was bone stock, it did 350whp and 450wtq from a simple ECU prgramming...

So my question is.... shall i go for JB4 ? and if i go for it, do i need to reprogram ECU to factory default first ?
Also since my car is Xdrive and AT 8 speed, the drivetrain will last ?
I want to aim for 400-410whp and a bit more torque.. since i am using it for daily driving and don't want to use E85 or meth or anything since running on 100 octane.
So suggestions are welcome !