I recently installed a Beatrush underpanel on my Honda Fit in an effort to improve fuel economy. It worked.
Comparing 10 tankfuls before installation to 10 tankfuls after installation, my fuel economy increased by about 2MPG (38-ish before to 40-ish after).
The panel itself is made of aluminum and feels very sturdy. It has cooling vents cut into it to draw air out of the engine compartment. It is very nice looking and well made.
Installation is pretty straightforward, 6 bolts going into pre-existing holes. The mounting hardware is made for Japanese-spec vehicles so minor modifications are required to fit US cars. Also the installation instructions are in Japanese, but the illustrations make it pretty clear what needs to be done. (I can't comment further on the mounting hardware because I bought mine used and it came with no hardware, so I made up my own. My comments here are based on the installation instructions.)
Once installed, the panel is very easy to remove. Take out the 6 fasteners and it's out of your way. Probably takes less than 60 seconds.
Here is a
link to the Kamispeed webpage that describes the part. I can't comment on Kamispeed as a vendor because I bought mine used from a private party. I don't know if anyone else in the US offers the part.
Below are some pictures of the Beatrush piece and my recommendations on how to install it.
First, the underpanel itself.
Here it is next to the factory undertray -- or more accurately the horizontal, under-car part of the undertray after I cut the vertical pieces off (more about that next). As you can see the Beatrush panel covers a lot more real estate.
I cut the vertical side pieces off the factory plastic piece and reinstalled them on my car. They finish off the insides of the wheel wells and prevent a lot of gunk from getting into the engine compartment. They're also very secure, connecting at 4 points; two at the top and one each at the front and back edges. I highly recommend doing this. Here are shots of the vertical pieces, driver's side then passenger side.
Finally, here is a picture of the Beatrush underpanel on the car. It covers the entire engine compartment all the way back to the front crossmember.
