The following are known Action Replay Codes for WCW Mayhem on Nintendo 64 (N64).

Device Compatibility: Action Replay & GameShark

Max Strength
802f16f50009

Max Impact
803121b50009

Max Speed
803156f50009

Max Quickness
803176b50009

Max Aerial
803196750009

Max Mat Ability
8031b6350009

Max Submission
8031d5f50009

Max Brawling
8031f5b50009

Max Dirtiness
803215750009

All Cheats / Wrestlers
810b115affff
810b115cffff