So I was gonna buy a 2016 sti but I have some concerns because it’s been modded with no tuner in sight and it scares me because it has recorded 20 psi on the boost gauge and idk what all has been done 20 psi ain’t stock right like seems like a lot I just don’t know what to look for or how to go about seeing if the car is in good health it’s only got 40000 miles but I just worry .help