it seems like the s4 bumper doesn't have much option for front lips, I've been looking around at a4's and they've got amazing setups on them, is the stock a4 bumper 2-piece? and then you just swap out the lower valance in order to go for something more aggressive? what options are you able to put lips on?

a4 bumpers can fit on s4s right? parts are interchangeable i assume?

 

no the s4 will take modification. So will the usp front bumper. The grills will not drop into a stock a4 bumper as they are too big and have no mounting points. i use to have a front lip on my usp but lost it when i hit the road pulling into a parking lot! Only draw back to having a front lip and being low is scraping!

 

soooo a4 bumpers won't fit on s4's?

 

u mean s4 wont fix on a4. IT will work but it takes a good amount of modification.