A fan has requested a special match. Complete a match in the Armax Arsenal Arena in which extra thermal clips do not spawn.
After completing some matches, check the Combat Sim Controls in the Armax Combat Arena to read the following e-mail:
Select "No Thermal Clips" as a modifier from the Combat Simulator Control terminal. You'll need to purchase the modifier from your previous match winnings—it is a silver level prize. Though Saburo requested Collectors as the enemy, it is not required. The other settings are up to you—since most challenges are not mutually exclusive, you could conceivably finish other nonconflicting arena challenges at the same time, e.g. Citadel Arena: Prothean Challenge and/or Citadel Arena: Spin Zone Elite Challenge.
After the match, check the terminal again for the follow-up e-mail. You'll receive 5000 credits and +2 Reputation for completing the mission.