The losi carb has a bigger throat than the traxxas carb. I tried it in my 3.3 in my revo. Made it through a tank or 2 of fuel then it started binding on me. It really did perk up the 3.3 before it started binding though. Might be easier on a t-maxx as the linkage on a revo is crap. I probably could have tried an alloy pivot vs the stock plastic to remove flex, but I was just trying it out to see if it would improve the 3.3's lack luster performance. It did improve performance a noticeable amount.
I ended up getting an OS21TM instead. Then I had to get RRP steel for the trans as I kept shelling gears out of the transmission. Then I got a set of dynamite max life alloy shoes for the clutch to get all the power to the ground.