TRC off... maybe u pressed a button or something something that switched your traction control off. If so, just press it again when ur done drifting like one guy said...
If VSC always on... dunno, maybe u screwed the Vehicle Stability Control and it needs checking...
when stock, using pe ti r, the exhaust sound still very comfortable, after done stage 2, bigger turbo, hi cam, the exhaust sound direct change to very very very loud. so so so so so noisy, currently running full...