HPS short arm air intake with K&N low restriction filter

Less restriction gives better throttle response and quicker acceleration. Since the MAF sensor accommodates the faster air flow, the resultant volume might be the same. The same thing happens in a turbo, but at a much greater extent.

Other cars on the highway are surprised that a hybrid makes a roaring sound under rapid acceleration.

The mount that my friend made, securely attaches to the M6x1 captive nuts that were used to mount the air filter box.

 

I don't get it. How does adding restrictions on the air intake help with power, efficiency and performance?

The ECU controls the vacuum in the intake. It would be an issue, maybe, in the days of carburetors, but not likely in modern electronically controlled air, fuel and mixture systems.

 

I don't know if the HPS intake will fit the 2016+ Gen 3 Prius. If the intake throttle is located in the same place, it might fit. There seems to be enough space under the hood and the Gen 3 Pruis uses the same form factor in the 2Zr engine, The MAF sensor is likely to be in the same place as well as the air breather tube.

 

Still, it's like breathing through a filter mask. It's easier with the least restrictive filter mask. The same goes for restrictive exhaust. The engine is basically a piston pump. The more restrictive the intake; the harder the pump has to work.

Low restriction intakes and exhaust are not there to make noise. On the hand, noise cancelling intakes and mufflers restrict air flow and engine efficiency. The benefit might even a little bit of power gain, performance and gas mileage.

Toyota has to go for noise reduction simply because customers sometimes equate human feelings of judgement for mechanical efficiency. It's like putting a sound and heat trapping insulation blanket on an AC compressor to please a homeowner.

Take the clogged filter or the clogged fan on the hybrid battery. To a certain extent, the circuit will compensate. But, we all know that it cools the HV battery better if it is clean.

 

That's fine. Removal of all those plastic parts frees the engine compartment of so much space that it harkens back to the days of cars of the 1960's.

Also, the resonator and the filter box often becomes a mouse nesting place as does the cabin filter housing.

I don't see a mouse chewing out the steel mesh screen of the K&N filter to get in.

 

Here's a photo of the install of a kit that I sent to a friend it Florida. The bracket is made of 16ga 1/2 inch wide stainless steel strap. The OCC mounts to the "z" strap using the two supplied bolts. They were too long and had to be cut shorter. A stainless steel M6 rivet nut is installed to the top of the "z" strap. A second strap is fastened to the top of the "z" strap with a M6 x 1.0x10 flange bolt. The "z" strap and the second top straps are fastened with M6x1.0x10mm flange bolts to existing threaded holes on the EGR bracket and the intake manifold.

Two sections of 3/8" fuel hose were connected with "Corbin" type spring clamps. The OEM PCV hose was disconnected but not cut and connected to a coupling that I machined from aluminum to connect the OCC.

I have attached a photo of his install, which he did with little effort.