they actually draw 19Watts more. despite popular beleif, the coupe foglight bulbs are 51 Watt, not 55. I found that out when i put in my SPP 55W superwhites. i dunno about 70 watt bulbs tho, hell, im weary about running 55's. When i had 27 watt bulbs in my turn signals they burned a hole right through the metal contact that touches the bottom of the bulb. the stock turn signals are 21 watts so thats only 6 more watts. you're talking about 15-19 more. They are different bulbs and attatch differently but i wouldnt do it. I would be too worried of frying a wire or worse....
-mark