How clean does it fit onto the stock low 3 piece? What does it cost?

Thanks

AFX/UDP,AEM,AF/X 55mm TB,50 shot of NOS,Glenn's short shifter,17" tantrum,prokit KYB AGX,JL stealthbox sony headunit,audiobahn amp,M3 style mirrors,Blue leds,yellow fogs,reverse ind,w

the wing is called "viper" (i think) from nopi, other sellers also have it... this one replace the entire middle peice the higher wing is molded to the lower stock looking peice.
as for price...don't know, i bought it off a friend