I'm truly humbled to see everyone's support for this build! I've just recently released all the CAD files I used to create the intake manifold for free on my site, linked below. Be sure to grab a shirt on merch.blackthumb.tv/ if you'd like to support my efforts! wiki.blackthumb.tv/wiki/Legacy/Supercharger.md

Your builds ground me as an idealistic car enthusiast. Like usual, thank you for taking the time to show us

So, supercharged flat 6 in a Legacy? HELL YES! Sounds freaking amazing and the fact that it is that quick without an after cooler is awesome and means you really do not need any extra boost on the current setup.

As a big 3800 guy, I know and love that sound very very much! Sick build.

Its never even crossed my mind what a boxer would sound like with a supercharger before, but now im in love and i want one lol

The later M90 superchargers off the 04-07 GTP came with a drive-by-wire throttle body. Not sure the throttle flange would match that Gen 3 blower, but the 04-07 blower (gen 5 m90) are more efficient. Also, there is a tool out there to machine the snout down to run a smaller pulley, and all you need is a drill. As someone who has messed with a lot of GTPs, that blower sounds like its spinning about the stock speed for a 3800, so you can definitely go down a couple sizes on the pulley. The 3.6 is going to be way more efficient at moving air through than the 3800 could ever dream of being lol. Awesome build! Thanks for the inspiration.

Looks like that engine could benefit from some motor mounts, other than that this an awesome build. I appreciate the enthusiasm!

I'm impressed with $1300 going that fast.

This is epic. mad love for the ez30. some solid engine and transmission mounts would definitely increase the driving experience. After installing Kien mounts in my 04 6 spd ez30 legacy, the throttle response was so much crisper and the engine noise inside the car increased massively. highly recommended for maximum auditory enjoyment.

Would be interesting to see some accelerating numbers before and after 😄

Port the blower. You'll gain about 1-2 pounds of boost. You can do it at home. Would be a cool video. Thanks!

As a Subaru guy and love your content. This is the kind of car shenanigans. My 1st swap was a JDM EJ207 in to a US Sti. Doesnt sound special but back in 2009 it was rare because of the US spec STi was a completely different ECU, sensors and wiring. I had to solve all these things myself, no guides, no kits. Nothing against the bolt-on guys, I just need more of a challenge. Im blessed with the ability and knowledge to completely assemble, install, manufacture small things, wire and tune. This channel is gold to me. Thank you Blackthumb.

I'm so glad I stumbled across this video. I absolutely love oddball, homemade, DIY builds like this. I bet that thing is a lot of fun.

I like it. You need to max out the stiffness on your mounts and soften up your suspension. You working with a split block so you need to watch an sti buck under boost. Try and hit that mark. It's something you can fabricate for a cheep awesome and effective solution. Have a blast.

You’re content is so entertaining dude, you do such a good job showing your process. I’ve been wanting a classic jdm car that I can mess around w and learn how to do all this stuff. I wanna do all of this you’re doing but I’m on such a small budget and very little knowledge so you help a lot

There is alot of space to fill with boost. It would have taken longer but separating the big pancake manifold into individual runners would have helped power and response drastically.

UKposts algorithm is a funny thing, I’ve been researching 3800 swaps and this video popped up, much to my surprise it’s fantastic, thanks for all the info brother and enjoyed this style of video. I’ll be watching more of your stuff from now on. PS: that H6 sounds fantastic with that blower 🤔

1st time seeing your content mate, and I have recently found a new love for Subaru's after pulling one apart....I work in a wrecking yard. They are so user friendly so I knew your video should be good. And it was awesome! You are definately a car guy! Not too sure about the LS swapped 8 you mentioned though, I had one of them and loved it for what it was. Looking forward to catching up on your content here in Sydney, Australia. ✊🏻

Great build. I love the creative design of the intake and your detailed description of the issues you faced.

That was such the best car video I've seen all year! I loved everything right from the get go: your confidence, comical anecdotes, your editing skills, your knowledge, that you were happy to share what you did, and you delivered your speech in a clear and concise way that was very easy and enjoyable to understand. Subbed. Greetings from Australia 🦘

It's always good to watch cool videos about about cool cars when you're working on your own

This is an awesome build!! Engineering your own parts is pretty dang cool and the car sounds AWESOME!!

Thing sounds Awesome! Glad to see that smaller pulley did the trick ! That boost level should be good for 50% more power than stock, minus 40ish hp for the belt load. Looks like a blast to drive. Congratulations on making dirt cheap daily look bad haha

Hey man! Just found you in my recommandations and i love it!😅 That is what car tuning culture is all about and not another guy who rebuilds a supercar (nothing wrong with that but to much here allready). Knowledge, Skill and knowing what you talk about, i am impressed! Keep it coming bud! Greets from germany❤

Adding extra dampening to the engine using stabilizing struts should help minimize the lurch during shifting. I think this will help it be even faster.

This is honestly just so awesome. Love your channel and videos. The enthusiasm you have has to be the best part though.

Really wish there was someone like you that had a video up on supercharging the 2.8L 24V VR6 with a twin screw. Super in depth and also concise. With good explanation and plenty of video showing how. Lovely. Deffo subbed.

Love the sound of it! Nice build!

Wow, what a great video! First off, i love the unusual project. I also love how explain clearly how you actually accomplished it, and you're right, you are hilarious! I'll have to check out some more of your content. One quick question, what kind of tuning did you have to do to get it to run with that boost, if any?

Sounds sick . Love the low growl and it looks torquey for a boxer.🤙🏽💪🏽🔥

The fun part about just slapping it together with improvisation, is the chance to make it even better! Slowly work better and more proper parts into the project and really fine tune the performance. This is really cool! I love to see how people can just find a junkyard super charger and slap it onto an engine, never designed or intended for one.

my dads got a 2001 Silverado 1500 with a 4.3 v6. He got it with around 20k miles, and today its sitting around 335k miles. Hes retiring this year, and ive always wanted to take one of these old 3800 superchargers and throw it on an old TBI 4.3. This video greatly inspires me to get his old ass out in the garage and try it!

Would love to see a scoop fitted over the super charger, to both cover and funnel air to cool everything , would be pretty neat Sick build! Love to see people modifying cars that people usually dont , makes you a pioneer 😊

Dude this thing is SICK, I love what you've done to it. My buddy's mom drove one of these legacies (stock) for about 18 years before it died and its really something seeing what it could have been. You got any more plans for the Gc8? I own a stock 97 wrx so I'm a sucker for Gc8 content and have to ask.

I hope the best for this channel, in depth and entertaining all at the same time ❤️

Amazing build and video bud!

Turbo lag makes me pull my hair out when driving a WRX. Thanks for making this video, I've been wondering what a supercharged (Roots/Screw) Subaru might look like, you did a great job. I wonder if an LS swapped awd Subaru is possible

This popped up in my feed today, so glad it did! Awesome build man!

The best parts of a supercharger are the increased power, whine, and it leaves the exhaust unobstructed for the glorious H6 sound. That is a hilarious, awesome and unique build; nice job man!

Both a super awesome, practical build & a wonderfully informational and edited video!

I can't wait to see what's next as this channel explodes. One thing: don't change the spirit of your videos as you get big! I love how you do everything: garage fab style with some new-tech productions like 3D printing, weird engine swaps and odd/novel build ideas using randomly chosen junkyard bits, and your humor/personality. Great job, I'm along for this ride onwards and upwards - subscribed!

First time seeing your content. You’re awesome!!! Such a great video. I LOVE the shadetree, yet techsaavy way you went about the build. 👍🏻

Seeing this build come together made my day!

Just stumbled across you, sick build and new sub😁

I've been searching for this type of thing for ages! Thanks UKposts recommended! I'd honestly likely buy this as a kit if you improved it and sold it, keep up the good work, subscribed! 🔥

Just found this channel love the builds! How have you not blown up yet!?!?!

I love the way you explain everything, top notch show material. You've earned a sub! :D

This is badass, just subbed!

Yooo, this channel is sweet! Subbed

Great video showing all the steps and what it took!

My new favorite channel. This is good stuff bro!

Just seen this on the subie fb group lol. Love it. Glad to see your channel is growing.

Very cool build! Love the h6. I'm glad I found your vid.

This is bad ass! New sub right here :) love it mate!

Just discovered your channel through this video, it's awesome dude! Keep it up, you'll get followers in no time

Got my sub. I Love this thing! It sounds good!

Man, such awesome work and creativity. Congratulations! I really enjoy the content of your videos. Keep up the great work!

I had a 98’ 2.5RS from 98 to 2003ish. I used to roll with another 2.5RS guy every now and then that had positive displacement supercharger on his. It was pretty fun. It had fun throttle response turning corners with the awd that I never felt with a turbo. I always wanted to drive one of the supercharged S4’s but never found the chance.

This video is outrageously funny! I've never seen your channel before, but I look forward to seeing more of you in the future; you've earned a subscriber. Great job and keep up the stellar production!

Awesome video! Really enjoyed it

Dude I am only 5min in and I have to comment on how much I'm diggin your wit. I dont usually watch videos like this all the way through but your easy to listen to and entertaining. Cheers sir and keep up the work! You've made this actually mad complicated thing seem obtainable to regular people like myself!

Awesome project, tons of info, gotta subscribe. Cheers!

Wow dude! Top tier content. You are an inspiration to all the Garage Mechanics/ Fabricators out there!

Totally rad. Really enjoy watching your process and outstanding commentary.

This channel deserves wayy more subscribers man keep up the amazing work! Keeping the real car builds alive!

i love theway this thing lifts the suspension when u get into it ...awsome build def erans you a new subscriber!

First video I saw from the channel. Well done. I wonder if more performance could be had with a modified tube runner intake like the stock one. Awesome job looks like a hoot!

Love it. Brand new sub. You got me. Would love to know stock wheel hp/torque vs boosted on this build

Well done!!💪

This is amazing. Sounds awesome!

Awesome video thanks. Definitely earned a like and subscribe.

This is growing to be my favorite car channel on youtube. Just a humble guy making insane things. You just gotta love it❤

Awesome build! I clicked on this just cause how unique this project was lol keep up the great work!

Bro this is awesome. It seems to run so smoothly.

My new favourite small channel car guy. I am so glad the algorithm brought me here. Im here to watch you grow man! Keep it up 🙏

Underrated channel. I'm looking forward to more videos, man.

My man! This just popped up at the perfect time. I am just now starting my ez30 swap on my 2 door gc. The plan is to supercharge it with an s4 blower. You are a huge inspiration!

i love what you did here!!! awesome job brother

One of the coolest diy builds I have ever seen on UKposts. Definitely just earned a subscriber

Very cool video, love seeing a sheetmetal intake manifold get fabbed up. How is the build handling heat accumulation during extended hard use?

I’m glad this video took off! Keep up the great work!

Hey! A new favorite channel! Cool build!

Badass build. First time seeing your channel.

This channel just needs exposure!!! Top notch please keep it up!!! Also maybe replace those motor mounts? Engine looked like it was moving

Love it man so cool! Just enough to make it fun 👌🏻

Big fan of your work!! I knew RTV was coming XD

Damn dude this is sick! Awesome job! I'm suprised you don't have millions of subs, keep it up

What a great video! Fun idea, great explanations and overall fun to watch! 👍

Love the supercharger on a subaru engine! I looked into it once when I owned my 03 outback but couldn't find any examples of supercharged engines

I love the way you break it down. You would be an incredible teacher. I enjoyed the video and the build thoroughly. Thank you.

This sounds really fun. I have a supercharged f150 and it’s addictive. Sounds like this is 300-350whp and equal amounts of torque. Torque is a beautiful thing.

sick build! one day I also want to make a custom plenum 😃

“You also just scan a ruler” holy shit I’m in tears this is amazing, that’s exactly where i got sold on your channel. Eager to see what comes next!

Great work man, this makes me want to develope some cad skills

That is a fantastic build! It looks like it would be very difficult to use intercoolers for the boosted air as there is very little space. Would you be tempted to fit a water or water/methanol injection system to the manifold? The kits are quite cheap but I've seen a few guys build their own too.

Super awesome! You definitely make it look easy to do!

Id live to see a dyno, 0-60 etc on this, dope and unique build man, you earned my sub.

Definitely subbing. Badass build my guy. Very cool

Fantastic video! Did you have to do anything crazy for tuning? Would love to do it to my phase 1 ez, but that’s without a stand-alone!

That thing sounds sick. 7k subs needs more such good quality