They didn't have to wait as long to exact revenge, however, getting the better of the Chiefs in last year's Anzac Day clash, before finishing any hopes of a Chiefs three-peat by knocking them out in a quarter-final.
Sio believes the recent big game history between the two sides will add extra spice to Friday night's clash in New Plymouth.
"Back in the day it use to be the Brumbies and Crusaders," Sio said. "Now it seems to be the Brumbies-Chiefs which is the big Australian-New Zealand fixture."
Sio will pack down opposite giant chiefs prop Ben Tameifuna. "I've been playing against him since schoolboys rugby in 2009, we've had a few good battles over the years."
- AAP