The only way to know for sure would be to remove the turbo and have a look. Or possibly check the cat convertor and see if its damaged inside or has any extra bits in there. Im sure some of the guys on here that started with stock 33s would know more.
Ive never driven a stock 33 so dont know what they are like with stock boost and response. Mine had a TD06 with 245rwkw when I bought it.