u/Training-Catch4221

I got a 2013 3 itr 6A recently (170k mi) and it felt very slow, like unnaturally slow. I did some 0-60 tests and the fastest I got with no TC and brake torque was 10.5s 0-60, and online the slowest 0-60s I saw for these are high 8s. Feels completely gutless under like 3k rpm too. Could this be due to dirty valves? I already cleaned the maf and changed the intake filter. Also struggling to average over 20mpg even when driving suuuper conservatively.

Just bought this beauty today! Saw it on FB marketplace and immediately fell in love. 170k miles but very well taken care of and drives wonderfully! Even has preferred equipment package with the Bose sound system and moon roof.

Yes I'm aware of how bad the knock is I have new bearings and I'm replacing them later once my exhaust isn't a billion degrees. But anyways does anyone know what this popping is? I'm assuming it's an injector getting stuck open because the car backfired suuuper loud the other day.