With just a map the 140PD Tdi will see a max of 170Bhp, the turbo is the same as on the pd 130 but the engine has 16 valves so it can create a bit more flow and generates more torque, however i will play safe and look at a turbo upgrade, the shaft on the turbo is slender so it snaps easily especially when it spikes/overspeeds. I would look for a bv43 turbo if i was you and i will make sure the oil pump was done before tuning that engine...