Product reviews for GrimmSpeed Hella Horn Wiring Harness 15+ Subaru WRX/STI

This is not for the BRZ or FRS. this wiring harness is for the WRX. It says it on their website and on the package itself. It does not fit the BRZ as it comes. Some modifications can be made and it can be made to fit, but it isn't a good fit, and it isn't secure. Unfortunately, you only find this out after you have removed your bumper to get to the horn.

This is supposed to have a connector that fits the factory connector but this is the harness for the WRX. It's listed on the manufacturers page as fitting the WRX so I don't know why they're selling it for the FRS/BRZ. It is a well constructed connector for the WRX  and it can be modified to fit, but it isn't a good fit.