Modules: 2015-2021 Subaru WRX & STi Tails for Turns ConversionWhat's it do? This simple module plugs in to the back of the stock tail light housings on the 2015+ Subaru WRX and WRX STi and moves the separate turn signal (a 7443 bulb) to the stock brake light position. This allows the 7443 socket to be freed up, which can then be upgraded alongside the 921 reverse light for additional back up lighting intensity! Installation Process No tail light removal necessary! These in line harnesses do all the work for you.