When you slap over fenders on, you're supposed to cut the oem fender high up, both inner and outer since theres two metal. Then you're supposed to reweld them back together so the its sealed. Doesnt look like they cut the old fenders high enough.
From the looks of the picture, it doesnt look like they welded/sealed the inner and outer fender back together. You'll get shit/waster getting inside your car.
Here's a good step by step of the process...
http://www.cardomain.com/ride/392168...-silvia/page-4