2017q50ss

I’m a new member and just purchased my first Infiniti! I got a 2017 q50 silver sport and am looking for recommendations on the first mods/ order of mods that I should do will increase the HP of the car. Any advice would be great. Note: I’m not looking to getting a tune until my warranty expires...

Im running jb4 map 3 on my stock q50ss whenever I step-down on acceleration car runs great but my problem is it will stay accelerating until I step on the brake and as soon as I release from the brake it will accelerate again by itself...so I pulled over put it in park and it will stay revs at...