Yellow connector under the seat, disconnect it, buy a 8 ohm resistor from either ebay or maplins etc, and either solder in into the socket or make up some cabling to suit.
In fact I even have a spare from when I did mine, so if you pm me your address i'll send you one.
Assuming its the same for the 147 as it is for the 156's it fools the system into thinking everything is still connected up, and doesn't dissable the system. I'm sure its just the seat pad sensor that needs fooling.
Failing that if you really wanted you could rip the guts out of the seat, and leave the seat pad sensor on the floor.
The Car in front is my crumple zone
UNDERSTEER is when you hit the wall with the front of the car
OVERSTEER is when you hit the wall with the rear of the car
HORSEPOWER is how fast you hit the wall
TORQUE is how far you take the wall with you