[s-cars] Some info for those wanting to swap to a B5 S4 6-speed

[Rich Letsinger]

It's a mechanical seatbelt locking mechanism.  If the engine and
tranny are pushed back in the car relative to the firewall, it locks
the seat belts assuming you've just hit a solid object with
significant force.  Without this bracket, or with it insufficiently
attached, your seat belts may not latch in a collision.

Personally, I wouldn't re-engineer this attachment.

Rich