well if you want a functional diffuser, the price isnt going to be $150 unless you make your own out of card board and fiberglass.
i think a front aluminum splitter made from an old street sign would do more for aero than a rear diffuser...
not impossible... just not a likely item for your car. not exactly a track favorite enough for companies to make functional circuit racing items. it wouldnt be very useful in drag racing, and certainly not autocross.
if you can come up on the price, i've seen people use diffusers from other cars on their vehicles (non elantra).. i think the Rx-7,8 after market has some and the BRZ FRS folks too
maybe see if genesis tuners have em?
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