Recently bought a 2016 wrx and might of bought it a bit too fast with out taking a good look at the after market parts. I bought it thinking it was 100% stock but when I showed the car to my friend he could tell it wasn’t stock by the noises it made. Doing some research I found that it had a pbv, electronic boost control, after market intake, and a after market muffler(couldn’t find the brand online). There might be other mods that I’m unaware of. I was planning on getting a stage 1 cobb tune(something slight) but now I’m to scared to change anything because of all the aftermarket parts in it. Someone please help as what i should do