Tial MV-S Wastegate 38mm Black w/ All Springs

( 9 reviews )


MSRP: $329.00


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Brand: Tial
Color: Black
Flange Type: V-Band
Flanged For: 38mm
Includes Hardware: Yes
Includes Spring: Yes, All Springs
Material: Stainless Steel / Aluminum
Water Cooled: Yes
Wastegate: External
Mfgr. Warranty: Limited Lifetime Warranty
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.


Universal Product This item is non application specific.
Please verify compatibility before purchase. May require some modification for proper installation.

If you’re looking for a reliable external wastegate that has been engineered, tested, and proven to give you reliable results, then you may want to consider a Tial unit. External wategates can endure extreme temperatures, and because of these reasons, the Tial unit has been crafted from fine alloy materials to provide the user with longevity they can depend on. 

Boost can be controlled from two top ports, as well as three bottom ports.  At just 3.7” tall, the Tial 38mm MVS wastegate is one of the most compact external wastegates on the market. This Tial unit will come supplied with all the springs, and some wastegates come provided with pre-installed springs installed by Tial, so you may want to verify which springs are installed before installing this part onto your car.

This product has no user uploaded media. You can upload your photo or video of your install by posting a review.




Tial 38mm
awdturbowrx 11 months ago
Ok first thing, the packaging was rock solid, props to Tial for that. The gate itself was a great piece and have had no issues with it at all. Only reason i gave it 4 stars is the v-band clamps they send you with are GARBAGE. Id prefer a standard v-band clamp over the weird ones that were sent. Still works great though.
Verified Purchase
LOLFUNCTION 2 years ago
Hands down my favorite performance mod ever to either of my subies. I absolutely love loudness, when my P&L quadtip and catless DP didn't satisfy me anymore this did the job. Puts a huge smile on my face every time this thing opens and I find myself giggling like a schoolgirl, I stuck with a EBCS because I like the sound of wastegate flutter rather than just open or closed you get with a hybrid MBCS setup
Verified Purchase
Quality part
2011WRXfan 2 years ago
Installed the EWG with the Grimmspeed up-pipe in a couple of hours (drive on ramps aid in ease of access). Had the car tuned and it rockets to redline and max boost! Yes, this sound like you're taking off in a rocket, but potential threats will most likely wet themselves before messing with you!
Verified Purchase
2 weeks wg
macarong1988200581739 2 years ago
bought 2 of them, couple times of two step and the wg went bad, leaking and i thought it was my fault till took the car to the shop, wg is leaking.

Worth it
Hellchaser 2 years ago
I needs an EWG since my boost creep couldn't be tuned out in my 5th & 6th gears so I added this onto my GrimmSpeed up pipe and had it retuned along with a few other mods. I love the scream it makes when I go full throttle & I have no worries of over boosting. I build & hold boost better. If you don't like loud I'd suggest you reroute the dump tube back into your down pipe. I installed it my self in less than an hour with a jack, & simple hand tools.


  • AnswerQ: Wastegate size  randice12306114 10 days ago

    2013 wrx stock turbo. Would you run a 38 or a 44mm ewg for this application?

    • A: The 38mm wastegate should be sufficient for your application.

      Josh P. 10 days ago

  • AnswerQ: Psi  Henry's04FozzyXT 7 months ago

    So would changing the springs change the psi in correspondence with that chart?

    • A: The spring would effect the wastegate's base boost level but if you are using a boost controller that will determine it depending on setup.

      Nick S. 7 months ago

  • AnswerQ:   mvp1616262641 9 months ago

    Will this fit the Grimmspeed 38/40mm external waste gate uppipe? Will I need a bracket? If so, which one?!

    • A: This will fit Grimmspeed's 38mm uppipe. Either an internal wastegate bracket or welding your internal wastegate's flapper door will be required. The bracket depends on the turbocharger but we recommend using a universal adjustable bracket.

      Nick S. 9 months ago

  • AnswerQ: Pro tune?  Landerson36 1 year ago

    If I was to get this and the grimmspeed up pipe and install it on my 2011 wrx with stock turbo and on a cobb stage 2 tune does it need a pro tune? And also what do I do with the stock actuator?

    • A: Yes, you will need a Pro Tune on your car to run the EWG. And you will also need GrimmSpeed's Internal Waste Gate Bracket. You can find that by searching part # GRM 010001

      Brady R. 1 year ago

  • AnswerQ: Supporting mods  Josh A. 2 years ago

    Are there any other supporting mods that you recommend once I get this EWG and the Grimmspeed uppipe?

    • A: If you do not plan on using just spring pressure to control boost, then it is recommended to upgrade your boost control solenoid. You will need a bracket to hold the stock wastegate shut and a custom tune.

      Zach G. 2 years ago