Beef Sirloin Tip Roast...Injection?

[NorCalTDS]

Hey all... I got my hands on a bunch of grass-fed beef that's been sitting in my freezer, some weird cuts.

Anyway, I have a Sirloin Tip Roast thawing that I'm gonna smoke on Sunday. I've smoked other beef roasts before as well as Brisket, but I'm wondering if anyone has any experience with this particular cut?

Also thinking about injecting it and wondering if anyone has any recommendations?

Thanks!

 

[Callahan-que]

No injection cook till medium rare.