Thrust' carbs needed zero tweaking out of the box(they set it up according to what i told them i was running). It was a bolt together and hang on to the handle bars build.... Highly recommended! Could i tweak for a little more somewhere, here or there? Of course!!... But their carbs give extra fuel(oil) to make sure you stay lubricated(i was told). I don't fully understand the theory, but it rips HARD! Give Brian a call at least.... This engine is a monster, and i haven't switched props, turned my PFP pipe into a wet pipe, or done any tuning.... Hope i find out later this summer what it can REALLY do with a few modifications! If there's any way possible to afford another $1800 to get carbs, manifold, and vforce 3 reeds.... DO IT!!!! if you can muster another bit for a PFP exhaust..... DO IT!!!! I know money is hard to come by, but i've never been so satisfied riding until i sunk everything i had into this set-up.... It's "INSTA-FUN!!"