ROTOLICIOUS

hey sup guys i recently did a t2 swap into my gxl now the car runs great could use some fine tuning tho but when i bought the engine he gave me a black box that has a mitsubishi symbol on it and he had told me its a knock box now is this something that i can use he said he had it in his and do i need this cause i dont know if i have knock control or what not i am affraid i am quite new to a turbo rotary so any help would be great thanks