Is that the alcohol version Dale?

I run them in both gas and alcohol applications.. 44's and the 46's.

Dale I imagine you've run a 41.5 tm38 at some point is there a noticeable power gain difference switching to the vm44?

On my hard running dune motors, big and small reed, doing this carb swap only,.. . changing nothing else.., there is a gain only in the UPPER rpms 6500+ of 5-7%.

  IMO If your not in a situation where you run at high rpm for very long the bigger carb isn't really needed.  If your constantly just shifting gears speeding up slowing down your not going to benefit.  The 41.5 will give a snappier response..goes a little further on fuel too...I'm running one on the "girlfriends" (ex.. ) bike we dynoed for the last pipe comparison, its in the 70's hp, great to ride.  Look in the dyno section.

All the carbs mentioned in this thread are good and will run well if their set up right for your combo...proper tuning is the key.
 
 Make sure whatever your working with isn't full of worn out pieces, especially the Keihn stuff.  Makes tuning a real pain..also if your mains, needles, needle jets all that stuff rolls around in your tool box in back of the truck between tuning sessions they will NOT be the correct size when you go to use them!!   I learned that many years ago the hard way with a beat up main jet.  That brass stuff is soft and fragile.