Brah you trolling?
There is no way you're going to be able to afford to own that car. All you need is one screwup and you're toast. Your insurance will be screwed, and your financers will take you to town over any damage you bring back to them. I know it sounds logical because it's barely more than a lesser powered car, but lesser powered cars are cheaper to run, repair and replace. I used your logic when financing a 1L fiesta, but the difference was a CHEAPER insurance. Plus crashing this would at the very least emotionally devastate me, so I don't drive like a tool which I probably would if the car was cheap enough to replace. I wouldn't dream getting behind the wheel of a GT86 - this isn't even a second car; it's a third car. It's more powerful, more expensive to even run, larger (has a wider body), and by the way - the GT86 is a RWD, do you even know what that is and what difference it makes on the road?
Also is that 4500 before or after interest on monthly? I'm assuming you're paying the insurance monthly, because if you have £4500 in your hand right now this would be an even more stupid thing to do.