those wheels look great! i like the big lip on them. as for lowering, i say no. i think the tC looks low enough stock. and after seeing pics of your car, it looks excellent the way it is. plus, lots of people disagree, but the ride quality does get rougher. i've had trd springs before. save the money and buy other upgrades. that's my advice. but do whatever you want and whatever makes you happy and love the car more. it's your creation.