That wing looks big enough to really throw off the balance of the car without a splitter and tray up front.  Perhaps it’s too low to be effective.  
I am personally always wary of throwing off the balance magic of the stock Boxster tomb stone spoiler.
I can recall first seeing a Boxster on the road way way back when and catching it pop up.  Didn’t know anything about them.  My first thought was:  what the heck is that thing?  Second:  it must provide additional cooling air flow for the mid-engine

.  Yes I like to embarrass myself every once in a while.
I have to admit I have become enamoured by its uniqueness.