Subaru STi vs. Subaru Six Cylinder - Which Engine is Better Part 2? 

Gotta say, the Sound factor is what makes me just want the H6 all the way, and keeping it NA with almost the same power as the STI swap would probably be a nice plus! :D

Of course, there is more to it than just raw numbers. NA reliability is heads and shoulders superior to turbo reliability. There is FAR less to go wrong, and when things do go wrong, NA engines normally survive, whereas Turbo engines often die (sometimes taking the turbo with them, or vice versa). Then there is the replacement cost. It's expensive getting the H6 into the car to start with, but if you do somehow manage to break one (less likely if it's NA) the replacement is SUPER cheap (I just bought an EZ36 for $400). On the other hand, if you eat an EJ257, you're in a new engine at least another $6k, and the odds of this happening are far higher than with an NA H6. So if you're happy with stock STi performance, and you're just looking for serious reliability, with the ability to recover at a reasonable price if something does happen, the H6 is a very attractive option.

H6: Stay stock or go crazy. No in-between. Sounds great! Separates the men from the boys.

Who would've thought a tubo car is faster than a non turbo car? Crazy stuff hear

Love your car guys! I’ve got a 3.6r liberty (legacy down under) and I want to swap the engine into a BRZ one day

Stoked for this follow-up! Nice guys! 👊

Very cool comparo and what a massive difference in STI numbers after that tune! I have 2017 3.6R Outback, numbers for later versions of the 3.6 are higher around 256hp, 247 ft lb of torque bone stock. Love that 22B impreza with the H6. It looks wicked and sounds amazing, I would personally take it anyday over any turbo 4.

There is aftermarket for the 3.0 and the 3.6 just take a look at the Australian subarus, they don't mess around, raptor supercharger, headers, intakes, exhaust, and not to mention the handling department.

Great comparison!! Good ol sti with cobb accessport to clean up the power band but I'd still stick with the H6 swap in my opinion.If that sti cost 25k to own I'd rather use the price tag of that sti towards the 3.6 if you want 500hp+. These 6 cylinders are pretty tough when boosted. A 3.0r with a gt3582r on 93 octane has made 438whp at 16psi. The 3.6r is virtually the same just bigger displacement so imagine the possibilities. 400hp+ on the 6 cylinder turbo is by far more reliable then the 4 cylinder with 400hp+. I still love the ejs but like you mentioned when it comes down to big power and reliability go with the h6, or go with the h6 turbo if you want to show diesel trucks that you can make torque too ;). In reality it's all on preference. Just good to know people are at least acknowledging the 6 cylinders lol keep that subaru love going no matter what the swap!!

I’n going to a wrecker today, they seem to have an ez36 that I could get for cheap. If its there, I’l take it. My little project is to use this engine in a 2008 slowbaru impreza 2.5i . Price for an sti engine in my area are about 4500usd, so a cheap 500$ ez36 make sense. I’l do everything myself including machining.

Great vid and info, I have both the GC 4cly and the H6 3.0r, I love both always have, when I rebuild the H6 I’ll either go SC or TB not sure yet, I have plenty of options here for the H6, expensive but it’s been done and available. Been enjoying your series with Bucky also, cheers. If I need wiring I know where to go fer sure 🤙

Just Subscribed. Im torn between a rebuild of my ej20 on my 02 wrx or the h6 swap. Im on the fence because im out of racing these days but still want the power when im feeling frisky. But i think the 6 cylinder would be plenty at around 250hp, just peppy to drive and handle. Great video!

Except if you want the ability to tow a small trailer and run 87 Octane. That goes to the application portion you were talking about though. Personally I am going to try it with a '09 Forester

love the sound of a h6 over my ej25 sure wish I could the swap and add a turbo

After getting out of the subie game for a few years and living with a JZ I’ll definitely say the extra .5L is worth it for a daily 600whp car. Much easier to drive and much easier to make power. If I ever got back into a Subaru I’d do an ez30 turbo.

I'd like an H6 for my N/A rally car. Heat management here in Texas is a real issue so I tend to lean towards non-turbo cars for that (though I do have an STI that I rally as well). Plus that H6 sound, mmmmmm.

Full build specs on the iWireH6RS can be found here - www.iwireservices.com/post/iwireh6rs-build-specs

My neighbor is selling a tribeca b9 with the ez36D and I was thinking of buying it for the motor and building it, turbo it, stick it in a cheap blown wrx/sti/2.5rs/or even a base Impreza

Hey @iwire you guys wanna make some $$$. Make a turbo header for the H6. That's the major holdup on these swaps.

Maybe worth checking (if you haven’t already) what Mighty Car Mods did to the 3.6 engine, I think its running just over 400whp which they consider safe for an absolutely stock block and internals.

I like the natural balance of the 6 cylinder. Someone said the EG 33 is stronger than the EZ. What kind of max boost can the EG 33 stand stock?

Turbo the H6 and it will blow STi out of the water with very relaxed 500+ horsepower

Hi. You are talking about the EZ36R that still lives in a Grey area of turbo mods. Have you thought about the EZ30R? It got a lot more parts on the market to modify with turbo kit.

I daily a 13 3.6 Legacy out of Elk Grove. .... it's a great car. Only thing I wish it had 6sp auto, and a brake pedal with less travel ect. I run full syn in the engine and diff ect. I also got my hands on some Bilsteins struts from Racecomp, and STI sway bar bushings ect. I wish the 3.6 revved out to 8k or so . 350 hp would be nice.

I want to do H6 swap in my 07 Impreza wagon. I want to keep it as a daily driver but get the most out it as possible within reason. Can you guys help with that?

my dream build is a tt ez36

California car laws get in the way of innovation.

Hey.. what is your opinion on swapping H3 EZ30D that have some sort of vtec (variable valve LIFT system..not avcs valve timing)? As far as i knew it only came in ez30D... Just asking if u guys have experience with that engine in tuning/exact model year that came with it...

Please do flat 6 in a base impreza that you pick up the car for few 100 and keep in budget

An NA H6 could not compete with a turbo'd 1cyl. The turbo is the "other" engine. You add all these cons like "you need a custom ECU and you wont pass smog" (why?) with the H6, but if you were going that far you'd add a $1000 turbo and now the STI has no chance. Depending on the actual H6 (EG/EZ)

Hey anyway you can help a brother out? I really want some aero guard for the side skirt. I have them for the rear of my GC, but can’t find those for the front/Side skirt. Any idea where I can find a pair?

What about that 3.6 EZ36 in my 2017 manual BRZ? Could I retain the stock tranny? Lots of room for the h6 and would be a very light weight agile rear wheel drive?

What do you guys think about using the 6 cylinder for a Baja Bug in off road racing?

I have a 1.6 2004 impreza that basically got for free what needs swaping for the 6 cylinder engine

Twin turbo eg33 is the future.

I think he likes the sti

Can I get H6 to rumble like a sti 🤔

Why does the 6 cylinder have to be done with a stand alone?

Do you do wiring harnesses for RHD 3.6 swaps using haltech into a GD?

Have you checked out Tim Schrick's flat 6 he uses for the Nürburgring VLN endurance races? Interesting development on that motor. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-YNU2UVaG4pw.html The motor in action (unfortunately in German) ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-bw1IsHZoTgI.html

You’ve gotta be talking about Crank HP numbers. I would never take a stock EJ257 to 400whp expecting it to last especially without torque limiting. Anything close to 400whp and up needs at minimum pistons. While a EG33 or EZ30/36 can do on a stock motor

Why no mention of weight?