can some one tell me how the stock exhaust connects up to your turbo?
mine is just connected by the exhaust sitting in the turbo. There are no bolts, flanges or gaskets to hold the xhaust onto the turbo. so when I plant the car u can hear the xhaust shift and even once I had the exhaust come off the turbo where it sits inside a lip.

what can i do to fix it?

 

The stock exhasut is held onto the stock turbo with three nuts. Sounds like something you've got isn't stock. Gotta pic?