[5][9][10][11][12][13][14] It has an ongoing upgrade project dubbed as T-155 Fırtına II, possibly changing its engine to Turkish origin to avoid Germany's restriction on Turkey's defence sales.

The T-155 retains most of the K9's features, such as the CN98 155 mm barrel and chassis, produced through the technology transfer of Agency for Defense Development (ADD) in South Korea.

[3] However, its turret reflects original Turkish design that increases magazine capacity from 24 to 30 while decreasing hull ammunition storage from 24 to 18.

[25] The new generation model dubbed "Firtina 2" was to begin production in 2017, featuring improvement to range and rate of fire.

The new vehicles were to be fitted with remote weapons stations capable of carrying 12.7mm, 7.62mm machine guns and 40 mm grenade launchers.