Using these Stoptech brake pads is straightforward. Just replace your old front brake pads with these new ones following the standard brake pad replacement procedure. Before purchasing for 2002 - 2003 Subaru WRX, check the pad fitment with the images provided because there was a mid - year caliper design change. When driving, you'll notice improved stopping power and a better pedal feel right away. For maintenance, regularly check the brake pads' thickness. If they start to get thin, it's time to replace them. These pads are designed to work well in both cold and hot weather, but extreme conditions might slightly affect their performance. Keep them clean to ensure noiseless operation and a long lifespan.