Throttle Body Booster ?

If Toyota could legally advertise 3 MPG more for only a $20 investment per car, they would.

 

i say give it a shot and let us know.

 

I would wonder why just 2010-2011? I believe all models since then, except for the Prius c, use the same size engine. The Gen 4 has improved efficiency, but it is still 1.8L.

Was there an engine design change in 2012?

 

Stop looking for miracles. There aren't any.
This is snake oil. Don't waste your money.

 

It says on Amazon it will fit a 2015 Prius 2 (didn't check all models as the 1.8L is common).

So if you are curious (and this a relatively low cost test), give it a shot and keep us updated

 

If this was beneficial it would be implemented on many cars. A lot of research goes into air box design and intake manifold design. Not worth it IMO

 

Possibly NSFW.

 

You should get the magnets for your fuel line too

 

There actually are benefits to adding turbulence to the intake stream... if it's controlled, and actually happening in the cylinder. That's what Toyota's done with the Gen 4's engine, as well as the new Dynamic Force engine for the next-gen Camry.

Adding it at the throttle body won't help.

 

A 'ram air' system will add noise to your Prius, not MPG and not power. It is hard to quantify how much noise is worth to you.
I recommend the Toyota air filter Genuine OEM Toyota 17801-37021 Engine Air Filter Prius, Prius V, Prius Plug-In | eBay

 

Neither of those are even actual ram air systems. A true ram air system would involve a scoop somewhere, and cutting a hole in the hood or bumper for it, the idea being that the car's motion through the air will ram air into the intake manifold, increasing power.

That is what is commonly referred to as a "cold air intake", although that's also a misnomer. Your stock induction system is, as far as I'm aware, an actual cold air intake, it'll have a duct to pull cold air from outside. Those setups don't have that, and will actually suck hot air from the engine bay, reducing power. I'm not sure how the Prius's ECU would react to hotter intake air temperatures, either. And, the cone filters they use on those setups aren't the best at air filtration, meaning that they can cause engine damage.

Leave the air intake tract alone, Toyota knew what they were doing.

 

K&N Air Filter Review - Debunking the Myths (and why OEM is better) - in a GM 6.6 Duramax diesel context, sure, but...

In addition, K&N filters don't filter as well (potentially damaging the engine), and the oil can reach the mass airflow sensor, and foul it with contaminants.

 

NO sorry, bad choices, BOTH.
You can't just slap aftermarket "racing" parts on an engine and make it a racing engine.

The ram air thing is more snake oil on a stock production car.....as is the K&N high-flow filter.

Modern engines are very finely tuned to run right with ALL of the stock parts in place.
Increasing the air flow IN will NOT give you better performance.
Odds are that it will get worse if there is any change at all.