So i got a s4 but i just bought a s5 front bumper.. is it just bolt on or do i have to modify anything??

 

The position of the molding will be off a touch but it has been done before.
You try looking in Archives about this yet Steve?

 

i look at all three pages of the archives but there are none for this situation

 

Oh,trust me,it has been done,haha!
Personally I like the s5 front.
It's the rest of the car that puts me off from getting one.(I try to stick with 1987 at the latest so I don't have to emission test here.But I just got an 88 ..cheap.couldn't pass it up)