Yeah, fogs should go right in with the stock Si lip. There's only one aftermarket lip that is in the way of the fogs, kill me can't remember the name of the manufacturer.

Here I found the pic --> http://img88.imageshack.us/img88/8452/lip2ws.jpg

You can probably cut out some of the housing and make it fit but it will look like crap. This lip does look badass though.