Have heard nothing good about hypercharger,said to be hard to tune.Also uses vacuum from your carb to operate flaps.Im sure it will increase air flow and fuel consumption but don't know about hp.Get yourself a BAK and be done with it.If you don't have pipes and re jet I doubt you will notice any gains at all.
A Hypercharger will give a bit more airflow and look very cool doing it. As was said, you'll need the jetting and free flowing pipes to get the most performance. Be warned though, all that money spent might get you slightly better throttle response and maybe 1 or 2 horsepower at best. It does look good though.
All the other air cleaner kits do as well or better than the Hypercharger and are simpler to install.
My 1100 came with 500km on it at the dealer, came with the hypercharger on it, tuned and jetted. I've talked to a lot of mechanics over the years about this and the ones who know the Yamaha cruisers well always have said the same thing about it; on most bikes they say it adds miniscule benefits. For whatever reason, they seem to see better outcomes on the 1100. BUT it's a given that you'll get more power with a pod kit under the tank.
So I went with SS custom's pod kit and kept the hypercharger on for looks. Even kept the butterfly flaps working.
have one on my 2004 vulcan. Due to the crazy air box routing on the stock vulcans this made an improvement in power and throttle response. I am happy with it, would not remove it at this point. It certainly brings challenges with installation and maintenance. Watch for the small springs on the throttle plates. Overall happy with it. Think hard about why you want to change your stock airbox. Horsepower gains per dollar spent may not be worth it. You will need new pipes, block off plates if you have cold air induction. I may not put up with the aggravation of installing one today, but back then it was worth it. Was able to get hypercharger kit cheap from Royal Distributing no tax sale, picked up Jardine pipes when they went out of business cheap. Some people complain that it pushes there leg out as it sticks out quite far and is large. All in all love the looks.
Think of it more as a cosmetic addition, not so much as performance. As it's been said, plenty of other free flowing A/C options that do the same thing and easier to install and maintain.
Forget the flapper box for anything other than looks/gimmick value. Save your money for gas/oil or tires. It will be better spent. The "holy grail" for air boxes/air induction systems, is *still* air. Slip a K&N in there instead and tune for that if necessary, and save a bundle. Also, the flapper box might interfere with your knee.
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