$6000 Carbon Fiber Spoilers vs Plywood 

Should've saved that $6,000 for the next engine 😂

After seeing how expensive this season is, it makes a lot more sense why some of the other series went away and why it took so long to produce this. Love to see it!

I really liked Nolan's attention to detail on where the vortex generators actually needed to go for his application. I've always thought it was strange that they seem to always get put above the rear window whenever a spoiler was used. Nolan looking back at his "test" footage and going ahead and putting the gens on the glass where it looked like they needed to go according to the yarn movement is a real big function over style and big brain move in my book. That low car front splitter made from a template copy and plywood was the jam as well.

Jeremiah continues to be the most underrated donut team member, as an engineer I love this man, making learning fun is such a great talent to have and he’s got it

New show idea: give each of the hosts their own budget to buy and modify any car they want with the goal of being fastest on track. It could be all the same amount, or you could do random drawings to see who gets different amounts. Everyone can take what they have learned from hi low and actually try and apply it. Also you can have some mandatory parts (safety equipment and paint jobs) that some of the budget has to go to.

The wind tunnel element of this video is absolutely awesome. Really cool to see genuine engineering principles being brought into this.

Building your own wind tunnel and being able to explain all of this is just great! We love ya donut

Whoever came up with the idea of talking about your sponsor while putting random objects in a wind tunnel is a freaking genius. You should adopt that strategy for every add. This is the first time I've ever watched an entire ad on donut and only one of a couple times I've watched a full add on any RU-vid channel. I did watch decent chunks of the Uncle Jerry has and enough of the first car relationship therapy sessions to understand the joke, but inevitably fast forward to the show content. I'm an underground member so that's how I eased my conscience about not watching the ads. But I'll keep watching them if you keep doing cool stuff during them. I'll have to.

Man! That wind tunnel to show the improvement was an amazing idea. Kudos to whoever came up with it

That conclusion seemed really rushed. I liked how in the first season you sat down and asked each other "does more money mean more better".

Aeronautics graduate here, great video and the concepts were extremely well explained! One thing to note though for low team is that the vortex generators help keep flow attached by energising the flow while it is still attached so it can remain attached for longer. Putting the generators so far down won't really be helping as by that point the flow is already separating.

Gotta say this has been your best engineering explanation yet. It was simple and accurate and the wind tunnel was great! Jeremiah killed it

I love how they utilize the talent at doughnut, James, the personality and spokesperson, Zach, all star mechanic, Jerry, the engineer who explains things, and Nolan represents us, the frustrated enthusiasts who is Ballin on a budget but you can see the frustration in his eyes but eventually turns to pure joy once he's finished.

I realize that your wind tunnel was an oversimplification, but it really is AMAZING for a car channel to have built what you did to show and explain the concepts.

You are KILLING IT with the sponsor segments. I have literally never seen anyone do a better job of it.

Since aero isn't entirely based on how it's made ( expensive materials etc ) but more on how it fits the specific track needs for the specific vehicle you want , half of the 6000$ should go to a consultation from a aerodynamicist for a custom made package. That would definitely show a better improvement on lap times.

Now we need another yarn "test" to see if Nolan's "vortex generators" work where they are!

I absolutely love this series. Never stop. Definitely bring back Nolan and James discussing which mods were worth the money at the end.

"We bought 7 nearly identical Subaru boxer engines" 😂 Thanks for your sacrifices guys lol

Adding those under trays really took this challenge up a notch

Well now I'm less embarrassed of my DIY parts 😂

I wish you guys would go back to the format that had Nolan and James discuss which mods they felt were most "worth it" at the end of each episode.

The effort this video took to film is felt and appreciated my dudes!!

Jeremiah’s engineering integration into all episodes of this season have been fantastic!

I love the new series, but I miss the parts at the end when everyone sits down and actually discusses each of the car's mods. Like the overall hassle of installing, and discussing whether it was worth the time and money, and if its even worth doing something similar yourself. I understand a lot of the info is in the video, but the overall conclusion for the part is a nice way to wrap things up. ps: team locar

Donut dudes, I'm literally one class away from my Aeronautics degree and you guys (Jerry, but I'm sure everyone was involved in research) did an amazing job discussing the aerodynamics of cars, producing lift, and producing downforce. Keep up the good work!

The better you get, the harder it is to improve. Loved the cinderblock in the wind tunnel btw lmao

I love how much of a rush production is once the track day rolls up, really seems like a time crunch

I love that clip of James crashing every video, it's gold. He will never live that down hahaha

This show has made me afraid of ever buying a subaru haha

I love the continued increase in the SCIENCE behind the equipment. I watch these with my boys to get them interested in STEM

I loved this episode you guys did a great job explaining aerodynamics in the simplest terms possible

For me, this episode was one of the best from this season. It just had the right feeling, the right mix of knowledge, science and humor. The installations were shown in detail, easy to follow and understand, immensely explained but thrilling to watch at the same time. Great Episode

As a former WRX owner, I was waiting for another catastrophe on track and the suspense did not disappoint! Good work, gents! The transparency of showing the down side is appreciated!

Did a good job demonstrating friction and pressure drag with the model on this video. Having an engineering degree with an automotive concentration, this video was very enjoyable

Love how technical these videos are

I love seeing Adam getting involved in low car. He's a get it done kind of guy.

Next Season can you switch the teams between high and low cars? I think it'd be entertaining to see how each of the teams reacts to now having to deal with the others parts considering how everything has gone so far. keep up the awesome work tho!

Thank you for explaining what each aero part does on the car. Really helped with understanding why each part matters!

I love this video! Thank you guys. Thank you Jerry for the explanations about aerodynamics. I'll use this video to better explain to my colleagues how aero works on a car and it's not just a "stupid accessory".

Jerry carried this episode with the nuance of aero. More like this pls

Donut is the only channel that can make ads funny and watchable

Appreciate the time you guys took to explain what each part does!

Windtunnel part added so much to this episode, amazing work!

This episode truly slaps! Jerry getting to nerd out and use his actual engineering with the mini wind tunnel, Nolan getting the satisfaction of mo money not being mo better, and no one blew an engine! Just lost a tire, which is stupidly minor in the grand scheme. Awesome episode, boys! 🍻

A bonus JerBear tutorial and a mini wind tunnel? This is a right slice of goodness! 👌

With the numbers you’re already squeezing from high car .6 seconds is a meaningful gain, low car gaining double that is easier considering. What I’m impressed with is that both actually improved on time with the weight increase, goes to show aero is pretty important

Finally, a video without a scam sponsor. Rare for donut media.

I'm not even halfway in and this might be the best episode of Hi Low yet. I'm hoping Low team may be onto an advantage with the vortex placement and the $100 active aero on the trunk.

Good episode, especially with the wind tunnel. I do miss the ending where you guys break down whether or not spending more is worth it, though.

Y'all did an amazing job on the wind tunnel segments. Threaded the needle of keeping it simple enough for the average viewer to understand, but in-depth enough to teach something.

First time I see this channel. Watched it, didn't expect it to be so thorough and high quality, the modelling part was super interesting. Loved it.

I would like to mention there is a reason why Subaru went with the roof spoiler versus the vortex generator on the 06-07 STi. It’s with the slope angle of the rear window pairing with the factory STi spoiler. The roof spoiler was able to redirect air more effectively down the rear glass, producing more air under the rear wing. The factory STi spoiler would shake like crazy at speed on the MY04-MY05 STi, but the spoiler shake was drastically reduced with the implementation of the roof spoiler. There may have been better results if the roof spoiler was utilized over the roof diffuser. Some may bring up the Evo having a roof diffuser. The reason it worked better for the Evo was the rear glass angle was less than the STi, the trunk lid was also longer, and the Evo VII, VIII, and IX had a more raked spoiler, where the STi was damn near vertical, so for the Evo, the roof diffuser worked efficiently, where the STi had more benefit from a redirection of air.

It would be interesting ina high/low season to do a followup with a third car, where you take the expensive parts where you'd recommend them, and the cheap ones you'd recommend, and see how that car compares against high and low.

The quality of these videos are unmatched man

This shows are so special. I'm writting an essay about cars and I decided to add ero dynamics and this video is helping me a ton.

Nolan’s jacket is sick, fits his Japanese mechanic look perfectly! Love the content can’t wait for the next episode

These sponsor sections are so good, makes me wanna watch em again instead of skipping

Best video of this series. Really liked the testing with the home made wind tunnel.

i love these episodes so much

“We are going to test these components HEAD TO HEAD and see who’s motor blows first this episode”

The wing doesn't produce downforce from air pushing against it, but think of it like an upside down airplane wing. The air moves faster under the wing then on top, causing negative lift. This is controlled by the shape and angle of the wing, similar to a wing airfoil.

I am so enjoying this series! Keep up the great work!

Much respect for building the wind tunnel and doing scale model stuff, that was super cool

Science garage was really one of the OG best series from Donut. But seeing these high low series it's pretty clear that it would have cost a lot to make other series simultaneously. Love this episode 😍

Ok…. I have to buy a T-Shirt now, just to help fund Donut’s consumption of boxer engines in this series 😂

Your expalantion with DIY windtunnel is great, it explains a lot.

“One gets cheap parts, and one blows up”

the model diffuser demo was impressive. great job as always!

Jeremiah is the reason I'm here. We need more of this guys engineering knowledge

I love the aerodynamics lesson. I’m a pilot and this is better than a few ground lessons I’ve heard 😂

This series has been the only entertainment I’ve been watching lol , loved the Tacoma series

Are we eventually going to see a HiLow drag racing season? 👀 I’m honestly looking to put my life into Motorsports and automotive full time and the donut media crew has inspired me!

10:16 FYI, don’t mount mount your splitter supports to the plastic bumper. For something that will see 10s and maybe hundreds (optimistic) pounds of downforce, the last thing you want is the support ripping out of the bumper or the bumper ripping out of it’s attachment points. Secure it so a stiff part of the body and preferably the frame.

Lovin this series. Gettin a little low car in the high car recipe and vice versa!

I like how they knew that putting a camera in the wind tunnel immediately meant we wanna see the camera's perspective of in the wind tunnel

Love how well the new high car color goes with low car.

Babe wake up new Donut video

Gotta love how James is never pretentious.

Gotta say, the scale model of the high/low trucks in the wind tunnel was a cool callback to the previous series at 4:50

I don’t think you guys can say you bought 2WRX’s anymore you’re basically bought four at this point

I love this new format of the video. It's like all your series combined. Jerry's explanations alongside you guys actually doing it, it's really nice.

I'm 15 and have learned most of the stuff I know about cars from donut big thanx to you guys

vortex generators on the roof are for side ways airflow to help direct it to the spoiler, it doesn't do much normally but at the highest level of performance at full speed, it helps.

Congratulations! This episode was awesome!!! The explanations was very cool and interesting! 🙏

I'm curious to know what each car weighs before, and after all of these mods.

High quality production videos as always Donut. You guys are unmatched ❤️

Great video. Aerodynamics dumbed down to the right level for most of us. Now I'm off to buy some plywood.

Front splitter from plywood? Jeremy Clarkson approves.

The wind tunnel was fantastic! Loved it and wish I could get my car or a scale model of it in a wind tunnel or makeshift wind tunnel. Really do want that gains over look/money dump

Love the cars are pain t-shirt ad, as soon as he got the wrong part 🤣 🤣 Very accurate 👍🏼

Getting into some pretty good times! Curious to see what you'll even do next in the chase for better times.

I'd be really interested to see Hi car and Low car in a wind tunnel now, I want to see if those lower mounted vortex generators made any significant contribution 😅 I also wonder if the big difference could have been caused by removing the entire bumper vs just the splitter, if that had a significant impact. Either way, awesome episode as always, Donut Media really is the best.

God I lovw this show! The video quality is badass! Keep it up guys. Late nights in the garage for life

Hi Low is amazing as a series, it takes time and money and honestly seeing you guys taking hits like blown engines really hurts. You guys are busy but I kinda miss the style of older Hi Low. More relaxed, showing bloopers and racing on the track. The building takes a chunk of a vid I know but seeing the racing take only a few minutes makes me wish there was more. Miss the old Hi Low but great job either way!

I love, love, LOVE that they have Jeremiah breaking out his "Bumper-2-Bumper" host energy and have him explain the mechanics and engineering principles behind these modifications. Adds a new dimension to Hi-Low that wasn't there in the previous seasons.

I watched this just for the wrxs. I love the work!

7:02 I study mechanical engineering at the university of Ingolstadt (hometown of Audi) and they taught us that turbulent air is better attached to an object which means that the vortex generators are way to much behind the “big curve” where the air starts to detach from the car. They must get attached shortly before the air starts to detach to generate turbulent air flow so the air sticks to the car for longer. Audi for example generated turbulent air on their DTM cars by glueing some kind of wires to the diffusor which allowed them to make the Diffusor steeper without detaching the air flow. Hence they had very slow air behind the car but very fast air unter the car.

giving a like for 3:00 forward immediately

Super fun episode! Kinda hurts to see low team getting shorted on part’s sometimes. They always seem to come back and crush it!