While the Blues may have surprised many pundits by overcoming the Hurricanes last week, Kirwan knows they are going to have to step things up another gear at Eden Park on Friday night if they are to trouble the red and blacks.
"They're the favourites; they're talking about winning the championship."
The Blues will wear a unique one-off jersey on Friday to help raise funds for Men's Health Trust New Zealand.
Blues v Crusaders
Blues: Charles Piutau, Frank Halai, Rene Ranger, Francis Saili, George Moala, Chris Noakes, Piri Weepu, Peter Saili, Luke Braid, Steven Luatua, Ali Williams (c), Culum Retallick, Charlie Faumuina, James Parsons, Tom McCartney. Reserves: Quentin MacDonald, Angus Ta'avao, Liaki Moli, Brendon O'Connor, Bryn Hall, Baden Kerr, Jackson Willison.
Crusaders: Tom Taylor, Adam Whitelock, Robbie Fruean, Ryan Crotty, Israel Dagg, Dan Carter, Andy Ellis, Kieran Read (c), Matt Todd, George Whitelock, Samuel Whitelock, Luke Romano, Owen Franks, Corey Flynn, Wyatt Crockett. Reserves: Ben Funnell, Joe Moody, Dominic Bird, Luke Whitelock, Willi Heinz, Tyler Bleyendaal, Tom Marshall.