For customers who placed a preorder on or before March 1, 2022: 

switching from Quad-Motor AWD + Max pack to standard Dual-Motor AWD + Max pack reduces price by $4,500 ($6,250 CAD) 

switching from Quad-Motor AWD + Max pack to Performance Dual-Motor AWD + Max pack reduces price by $2,000 ($2,750 CAD) 

For customers who placed a preorder between March 2, 2022 and May 25, 2022: 

switching from Quad-Motor AWD + Max pack to standard Dual-Motor AWD + Max pack reduces price by $6,000 ($7,750 CAD) 

switching from Quad-Motor AWD + Max pack to Performance Dual-Motor AWD + Max pack reduces price by $1,000 ($1,250 CAD) 

https://www.theverge.com/2023/4/7/23673961/rivian-performance-dual-motor-availability-max-pack-battery