Just put on a new set of 17x7 ET42 with Yokohama Advan Flava tyres (205/45/17) yesterday. Just did a little normal driving so far so I couldn't comment much about FC or acceleration. However, the car's been a lot more stable due to the wider tyres... at the cost of a harsher ride

You can check the size of your rims/tyres just by looking at your existing tyres to see if they still fit on your new rim of choice. Not sure about the GE but the stock GK rims comes in 2 different sizes ie 15-inch and 16-inch (diameter).

Some read up for you here: http://www.popularmechanics.com/cars/how-to/a3682/4281033/