[GoremanX]

I don't know that. I suspect one would be hard pressed to tell the difference.
Bolt up a Hotchkis bar if you want a noticable difference.

Guaranteed there's a noticeable difference going from 28mm to 30mm. I found the 30mm Impala SS bar to be a much better match to my 21mm rear panther bar than the stock wagon 28mm was. I found the 32mm 2nd gen Trans Am bar (which also has slightly shorter arms) to be too stiff. These were all hollow bars. 2mm of diameter makes a ton of difference.

 

[GoremanX]

I mean, I assume they've all been hollow. I've never seen GM provide solid bars from the factory.

 

[GoremanX]

Huh... now I'm tempted to cut the trans am bar to find out. I have a solid 2nd gen 1.25" bar from PTFB and it weighs noticeably more than the OEM bar that was on there before

 

[GoremanX]

Missed opportunity by GM, I guess...

 

[GoremanX]

This seems like an odd thing to be debating...

 

[GoremanX]

FWIW These will not fit on any wagon. GM has a brace OEM that interferes with the DMR brace.

Dick Miller makes a wagon version

 

[GoremanX]

Pretty sure he posted the wrong photo. That shows an unrelated side frame rail.