Tristan - I'm in the same boat although not as heavy with the 968. Based on the 25% gain I should make 236hp at the crank X 125% = 295 hp at the crank, less 15% driveline loss = 250 rwhp.

I am not remotely close to that number...but just had a top end motor job done so we'll see what she does on the dyno in a couple weeks. Regardless, there is no remote chance of 250 rwhp with a legal motor - even the FireHawk 968 cars make 235 at the wheels with race pistons, cams etc...