List your favorite mods and why.

So I got into the Prius game last year and has fell in love with this ecofriendly work horse.

After buying this beast at 159k and just put over 15k in the last year she is purring like new.

I haul heavy stuff for camping and for work and I noticed my rear end sagged on heavy loads. So I bought helper spring lifts for $12 at Autozone. This kept the rear from sagging and it's strange how a car of 4 people can make the rear sag. Also sagging is bad for the spring life and handling is comprised. So this mod is safety mod too.
1. drill holes in to rubber bumper lifts to allow zip ties to hold rubber lifts.
2. Jack up car and slide rubber lifts in springs.
3. Make sure the zip ties do not rub against the brake line since the clearance is very close.
4. Double check clearance after tire is back on and car down on the ground under load.
$15 mod 1 hour of labor. Skill Level need out of 5 is 1. Very easy.

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It drives safer since the car height is corrected under load because of the lift helpers, it feels fine and stiffer. No fish tail no unexpected changes.
What I noticed with heavy loads before the spring helpers is the body would roll and car would bottom out. No more heavy load problems.

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Here is another cheap mod which made a huge difference for safety and freed up power consumption by pulling the old incandescent lights for 20 watt total LED bright white. Driving at night is almost blinding for on coming drivers. No reason to swap out for Toyota HID lights.
$20 1 1/2 hour labor and skill level out 5 is 3.
You really need to pull the bumper cover off.
To access the bolt to pull the headlight housing.




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When I change the H4 bulbs on my Prius and I mentioned that it was so bright it was blinding oncoming traffic I was speaking in hypeboley. This how the President Trump speaks, have you been living under a rock for the last 3 years. This how American english is now. No facts just lies.

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I can't understand why you're so defensive.
You're either a Trump supporter or you just don't get my humor. Either case it wasn't meant to offend you. So if people with bright LED headlight is hurting your night time vision. I get it.
That's not always the case for all LED lights, but I feel my LED light mod set up is good and safe for the driver and any other drivers on the road. It's not a wide beam and pointed down correctly according DOT specs.
I'm familiar with LED lights and led mods here is my other work.
These are illegal mods for the street but works great for off roading.




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Another favorite mod is the oil catch can and its benefits: I finally got a baseline of 44 mpg on my 2009 Prius after 6 months of ownership, she has 175k now with original Hybrid battery. I tested the battery with Torque app and confirmed the battery 28 packs were in good to above avg condition. I drove the in stop and go traffic of Los Angeles with a roof rack for over 6 months and really couldn't get above 34 mpg at best. I was seeing average tank around 30mpg for 10x fill ups. Even though I changed my PVC valve, engine Oil, Tranny Oil(OEM ONLY), New tires, Spark plugs, checked starter 12v battery in trunk, everything checked out ok. So one of the changes which made some difference was installing a Oil Catch can from the engine PVC valve to the throttle body. I noticed oil droplets at the bottom of the throttle body, so a cheap mod and $30 dollars for part and free installation, she was running a little cleaner. I noticed after taking a 200 mile trip to San Diego the oil catch can made a huge difference to my highway MPG. I was getting 40mpg now with the AC on. Just after 3000 miles the oil catch can was 1/6 QT full of oil. I've read the oil catch can works best when the engine is on and above 3500 rpm, which means people who do a lot of highway driving and above 55 mph will see the most benefit from this mod. It's seem the engine produces more oil vapors at high RPM's and is sucked down into the throttle body.
*** (Honestly, if I'm cutting the oil burning and keeping the environment a little cleaner and preventing the Catalytic from fouling and its all worth it.)

That got me to thinking the few droplets made an impact to my poor gas mileage, because my other long road trips I was seeing 35-37mpg with AC on at best. So I noticed my city driving I was still getting around 30-33mpg with the AC running all the time. So I decided to run a baseline test with a full gas tank and drove my tank empty today after 370 miles and two weeks of driving without the AC in LA traffic was insane. 90 degree days and stop and go madness and hypermiling when ever possible. I was able to achieve 44 mpg wow. I was excited at best now I know my Prius can get the average miles other Prius we're getting. So I now know it's all about the AC, Hypermiling and keeping up with maintenance.
Special note: All MPG number we're done manually, I noticed Prius Dash showed me different MPG average number. It read 40.1 even though I put in 8.4 gallons of gas got 370 miles. So it's best to keep track manually when coming up with my baseline.

This $30 mod 1 hour of labor and skill level is 2 out of 5 not difficult. Will need some tools.

Here is my oil catch can set up:






Here is the oil in catch can after 2000 miles of driving:


Here is the oil droplets in the throttle body before oil catch can:


Here is a picture of throttle body after running the oil catch can 2000 miles:



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