yes you can play pirated games online but u must flash your 360 with the latest firmware IXTREME 1.6.
You will get more answers if u post questions on this thread http://www.pakgamers.com/forums/xbox-hardware-faq-guides/25339-xbox-360-firmware-thread.html
You will get more answers if u post questions on this thread http://www.pakgamers.com/forums/xbox-hardware-faq-guides/25339-xbox-360-firmware-thread.html