If you plan to change anything, an exhaust cam would be it.... The stock cams are fine. If you go with a higher cam profile, it will cause more overlap of your intake and exhaust valves...(Meaning they will be open together for a longer duration of time)... When you do this, the turbo basically forces the exhaust gas in and back out of the cylinder....... stock cam profiles work great.... You may want to change the exhaust cam tho, the stock intake cam will allow plenty of air in do to the charge caused by the turbo. Changing the exhaust cam would actually allow more exhaust gasses out and let the turbo react a little quicker during spool-up......