Pretty sure, this is endorsed. Damn, these 2 have some Pipes....
https://www.youtube.com/watch?v=k3_RU30tEIE
https://www.youtube.com/watch?v=wC64ZPJXMGU
https://www.youtube.com/watch?v=k3_RU30tEIE
https://www.youtube.com/watch?v=wC64ZPJXMGU