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Mazdaspeed Dual VTA Bypass Valve

Price: $279.99
Price in points:  What are Points? 280 points
Top view of the CorkSport Dual VTA BPV for Mazdaspeed 3, Mazdaspeed 6, and CX-7.
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The CorkSport Dual VTA BPV provides features and performance to suit stock cars and on up to big turbo high power setups. The CorkSport Dual VTA BPV holds 50psi, responds in 50 milli-seconds, and won’t stall your car coming to a stop at idle. All this comes in a compact design with nozzle adjustability to allow for easy installation in even the most cramped engine bay or with custom piping. #ZoomZoom!

Check out the installation instructions below. Share your performance review with the CorkSport community once installed!

The CorkSport Advantage

Mazdaspeed 3 bypass valve

Responsive Performance

The CorkSport Dual VTA BPV responds as low as 50 milli-seconds keeping pressure in check and the turbo spinning freely. This is made possible with a few key features:

  • The piston weighs a mere 38 grams with the O-rings installed which reduces the required force (and therefore time) to accelerate and move the piston.
  • The piston and body design work together to minimize the chamber volume at the top of the piston. With the smaller volume there is less air to be removed before full vacuum is present, reducing the amount of time needed to start moving the piston upward.

Mazdaspeed 3 BOV

No Leaks

O-rings are used for all critical sealing interfaces to provide a valve that can stand up to the pressure and has been tested to 50psi.

Mazdaspeed performance bypass valve

Dual VTA-Bypass Design

The VTA design of the CorkSport Dual VTA BPV allows the valve to function as a normal full recirculation design for most daily driving situations; essentially during minimal boost pressures and light throttle lift-offs.

The VTA ports will then be utilized for medium to high boost and abrupt throttle lift-offs. The higher boost levels cause a larger pressure differential between the intake manifold and charge pipe during throttle close, resulting in the BPV piston moving further, opening the VTA ports.

Mazdaspeed dual port bypass valve

Flexible Design

Standing just 2.5” tall, the CorkSport Dual VTA BPV is compact which is great for compact engine bay and custom intercooler piping. The VTA BPV also features and integrated hose port to reduce the chance of leaks and lost parts.

The nozzle features 3-way adjustability allowing the nozzle to point 15 or 30 degrees off-center.

Additional Features

  • Materials & Manufacturing: All designed components are CNC machined from 6061-T6 and anodized for long lasting durability then bolted together 18-8 stainless steel hardware.
  • Serviceable Design: What good is a performance part if you can’t properly take care of it? The CorkSport Dual VTA BPV can easily be disassembled, cleaned, and re-greased for long lasting performance.
  • Compatible with: MZR DISI Engine found in Mazdaspeed 3, Mazdaspeed 6, and CX-7
  • Any Climate: Tested to sub-zero temperatures to ensure operation in extreme conditions.
  • Engineered in America: Designed and Manufactured in Vancouver, Washington, in the Pacific Northwest.
  • CorkSport Service & Support: 2 year limited warranty, full color installation instructions, all necessary components, and knowledgeable telephone support at (360) 260-2675.

How To Install Your CorkSport Dual VTA BPV

It will take you 30 minutes to install the CorkSport Dual VTA BPV with our easy-to-use instructions.

30 Minute Install Time

30 Minute Install Time

Difficulty: 2/5

2/5 Difficulty

2-Year Warranty

2-Year Warranty



Before I bought this, I didn't know what a BOV was. Now, I think the thing is the coolest thing on my MS3! I never heard anything but what I thought was the turbo spooling up when I put the Stage II CAI on my Speed. When the BOV was installed, that cool sound went away and instead I heard this whistling sound every time I shift. I noticed a drop in my average mileage, but now think it was from accelerating faster and more often. So, now I need to figure out how to include this valve in my increasingly modded MS3. Tomorrow I get the oil catch can, which might reduce my soot(?) and my question is "when do I stop modding?" I guess the answer is "not yet".
Had it for a couple months now with zero issues! I am full bolt ons and purple drank tuned on stock k04. Whistles under light loads and even during cold starts I can here it whistle slightly as the rpms drop. I have no drivability issues, it bolted right up. Only complaint I have is that it doesnt come with an oring, you need to reuse your stock one, not there fault but I bought my car with a forge v2 and I didnt get the stock valve with the car or the o ring, it used a different o ring so I had to order a new one from Mazda. Other than that its great.
They don't send a new o-ring. It's like what, $3? Instead of using a potentially old and cracked one, or not even having one as in my case. Just another way CS continues to make things more complicated than they need to be.
Installed this BPV yesterday and right off the bat i have to say i love the high pitched chirp i get with just about every shift. Made a noticeable difference in the way the car builds/holds/releases boost. Once you hit the clutch to shift at WOT the turbo lets go of the pressure and is IMMEDIATELY ready to spool again and spool fast! My only gripe is the small whistle you get under cruising speeds. It's not a bad sound. Just different. I feel it will grow on me. Also received pretty incredible service from Brett. Would recommend this part to any and everyone who is modding their MZR DISI!!!
Cannot say enough good things about this BPV. Gets the nice chirps of the blow offs without the hassle and surge issues that come with BOV units. This is an excellent upgrade whether you're looking for better sounds or faster blow off for an upgraded turbo. Have only had it on for 3 weeks but get compliments on the noises everywhere I go. 10/10 would recommend this over any other BPV or BOV on the market. As always with corksport installation was a breeze. BUY THIS THING AND MAKE YOUR CAR GO ssssssssSSSSSSSS PSSSHHHHH pewwww.
5 stars across the board on this one. Beautiful design, quick response, good price and LOVE, LOVE, LOVE that VTA sound. Not too loud, but enough to induce eargasms.
I was a tad hesitant about the price. Boy was I wrong. I was running a different brand name bypass valve when I swapped my turbo. Although the other unit's spring was rated for 24lbs, it just was not responsive and wouldn't hold boost that well.

The CS hybrid valve is super responsive. It will recirc under low loads and let off under higher levels. Not loud at all. Made my turbo system very happy. Wish I would have done sooner. Solid construction. Breathes well. Helps shifting. Did not notice any fuel trims during venting either, which was a concern of mine by switching to a hybrid. A+
This bypass/vta valve is amazing! It took me 10 min to install. I went for a drive and the chirps and whoosh of air rushing during wide open throttle is satisfying! The construction of this product is on point, not cheap and doesn't look cheap. For the price it's a good trade off for how good it looks and sounds. Its not complicated with other 50/50 blow off valves where you have to adjust them. This product is like a two in one. I'm glad that it doesn't look like a trumpet for the vent to atmosphere port. It holds boost and does whoosh when your going wide open throttle. Corksport, you guys never disappoint!
Awesome little BPV/BOV. I was running the Forge v2 before this one and wanted something a little different. Always liked the thought of a dual VTA option but didnt want any problems with my custom tune because of the VTA. Install was a breeze and it fits prefect without having to adjust anything. It has a cool array of sounds from a small whistle on light shifts to a nice whoosh on full boost shifts. Its a little more expensive than others but I would buy again in a heartbeat. You get a great BPV from a great company that is always making new stuff for our cars. Cant go wrong with Corksport as a whole.
This valve installs like any other valve. Only difference is it comes with it’s own vacuum line which is silicone and stretches and squeezes over the vacuum ports without needing a clamp. I removed my TMIC which isn’t required, just a personal preference.

Previous valve was an authentic HKS SSQVIII. This CS valve is lightyears ahead in smoothness/quickness.

Response, Flutter, Pressure Holding Response is probably the quickest on the market, smoothness is unreal, you cannot even feel it operate. I was able to hit over 24 psi on an original K04 turbo

It’s not a loud valve, but it makes a lot of whistling noises while driving around. Part throttle shifts it has a whistle sound similar to a Greddy Type S. WOT it makes a standard pshhh sound followed by a whistle.

It is very small, a nice black color with a CS logo. It has a very high quality feel and looks high class.

Once I figured out the vacuum hose, the rest of the install was no different than any other valve.

This valve is probably most comparable to the Turbosmart 50/50 valve. It is very smooth and very quick. Probably the best functioning BPV I have used. It uses the OEM BPV gasket so that is something to keep in mind if you no longer have yours.

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I am little concerned about the vacuum hose that mounts on top of it, its position makes it difficult to using a clamp there. So, can we use the stock hose with the clamp there or we have to install a hose provided with the BPV.

Asked by Vic | 09/29/2017, 05:55 AM | 1 answer(s)

What the difference between this and the MZR Bypass valve - is it just the ability to switch to VTA? I have the CS Airbox on my car right now, will either option fit?

Asked by Adrian | 12/13/2016, 01:11 PM | 1 answer(s)

Will this need to be tuned to operate properly? Or no matter what mods you have stock or big turbo it will still be plug and play.

Asked by Jose | 11/16/2016, 05:35 PM | 1 answer(s)

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