Got the certification paperwork from Toyota for the engine power and throttle response changes. Car feels completely different, with more power everywhere. What felt like turbo lag on transient throttle above 4,000 rpm was actually throttle lag. That's gone. Was worried about the throttle possibly being a little too aggressive, but it's not. I chose to leave the power steering and "Track" mode AWD split as-is.
You don't just go to GR Garage for this. I had to make an account with Toyota GR through Kinto, register the VIN, and some other hoops and questions to get through. A few weeks later, the GR Garage you chose for the upgrade will contact you for an appointment to get it done.
The power bump is only advertised to bring it up to the GRMN spec, with 390nm, but it feels like more than just 20nm, and it doesn't go away in the top end. It pulls harder from 3,500 to 7,000 than it did originally with the HKS exhaust. I asked about this and while being vague...was told that there's more going on than just a simple torque bump. With a completely stock car, you'll get 390nm and a little bit up top. But with the new engine calibration plus good exhaust, it's likely close to 400nm, and as long as the AIT stays in check, close to 300hp, JDM cars being about 270hp stock.
Next mod will be making a new intake to the air box, some insulation for the air box, and shrouding/ducting to get fresh air to the lower duct and engine room air out.
If it doesn't stick to the stainless, I'll strip it and passivate it back to its natural state, or maybe even polish it.
