The Hobby Boss 1/32 P-61B Black Widow kit is a tremendous kit but there are some omissions and inaccuracies and no representation is made of the exhaust stubs that are visible if the engine cowl flaps are in the open position. This resin set adds the exhaust stubs which can only be fitted if the open cowl flap ring is used. Because of the way the kit engine mounts are designed, these exhaust stubs are not suitable for use on a model without the engine cowlings fitted. They are applicable to both P-61A and P-61B Black Widows and are intended for use with the Hobby Boss 1/32 P-61B Black Widow kit.