Brant - Bypass Loom

Hi All
This could be a stupid question, I had a bypass loom fitted by Subaru last week and they said this should help with the Brant NOT to stuff up.
Has anyone had this done, did it help and what's it doing?
B
This could be a stupid question, I had a bypass loom fitted by Subaru last week and they said this should help with the Brant NOT to stuff up.
Has anyone had this done, did it help and what's it doing?
B