Your problem is reaching 155 mph (250 kph) is going to be power, not to mention other things that have already been mentioned.
The power needed to push the car increases as the cube of the velocity. A car cruising on a highway at 50 mph (80 kph) may require only 10 bhp to overcome air drag, but that same car at 100 mph (160 kph) requires 80 bhp.
With a doubling of speed the force needed quadruples. Exerting four times the force over a fixed distance produces four times as much work. At twice the speed, the work is done twice as fast.
Since power is the rate of doing work, four times the work done in half the time requires eight times the power from the engine.
So, if a stock Margalla can get to 100 mph (120 kph) with about 55 bhp (I am guesstimating here), the same car will need about 250 bhp to get to 155 mph.
Plus, you have to be stable at that speed, and be able to stop safely too.
You may draw your own conclusion from that.