It is strong and lighter because it is solid form.
The 3 piece is built heavier and stronger, in order to keep the strength, the bar is held in double shear with 2 attaching lug points and the load is spread with the large gussets.

This allows for attaching the additional brace, and also allows the pros to weld in the tower attaching portion but still leaves the possibility of removal to gain access to the trunk bulkhead.
It does weigh a bit more and is a whole hell of a lot more difficult to make.
EDIT:
PS, Eric... NO offence but... We know what we're doing.
The 3 piece is built heavier and stronger, in order to keep the strength, the bar is held in double shear with 2 attaching lug points and the load is spread with the large gussets.

This allows for attaching the additional brace, and also allows the pros to weld in the tower attaching portion but still leaves the possibility of removal to gain access to the trunk bulkhead.
It does weigh a bit more and is a whole hell of a lot more difficult to make.
EDIT:
PS, Eric... NO offence but... We know what we're doing.



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