Sask-king306

I have a 2001 Audi A4 1.8T, my exhaust is broken so I am getting a new one, I talked to a mech and I'm not sure what to do he wasnt to sure himself but I am looking into getting a new performance exhaust done, He suggested to fix the stock instead of doing performance because I might lose power with a performance exhaust. I am confused with what to do, my current stock exhaust broke right after the flex pipe and I already notice a lost in power. I want more acceleration and power what should I do?