any point of changing to a aftermarket cat with stock zorst??
any1 no
No point, if your planning on changing anything it'll be headers/cat/exhaust/intake in one hit. Might as well make the full ins and outs more free flowing but as petrol prices are rising we are screwed unless we are rich!!!

How many dB are you running your exhaust Curik? BTW why are you getting rid of the exhaust?