I made 162hp & 145lbs/ft of torque during a clubgti meet at Garage streamline in London a few weeks ago - it's known as being quite a tough/accurate dyno - it made this with cat back Jetex exhaust, Airbox mods, Pipercross filter and aftermarket chip.
So I would say around 155hp would be a very good guess - de-cat has been reported to make next to no difference to power output, but can change the feel of the engine (snappier)