need help

Hi, first ever post here. I have a 2011 Speed3 with an engine or something near it that makes the knock sensor go apeshit around 1750-2500RPM and light load (the problem actually seems to get better the more gas I give it; WOT is normal but I don't like getting on it too much because of my tune...

08 mazdaspeed 3 Fbo besides manifolds bnr s4 pd tuned Having a weird issue where the car wont go over 4-4500rpm it just hard cuts it runs fine until i get to 4-4500rpm. But it happened out of no where and stopped for like 4 months but and now its doing it again. i have replaced plugs, vvt and...