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Tial MV-S Wastegate 38mm Black w/ All Springs ( Part Number:TIA MVSBK)

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

Manufacturer Part # MVSBK


MSRP: $329.00

In stock! Ships same day
Qualifies for free shipping!

Buy as a package deal and save:
Grimmspeed 38/40mm 2 Bolt Uppipe Wastegate Kit ( Part Number:GRM 059001-WG)
Grimmspeed 38/40mm 2 Bolt Uppipe Wastegate Kit
As low as $621.10
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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 wastegates 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. 

This is the 38mm MV-S External Wastegate that will come in the black finish, and it will come provided with all springs. 

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.

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Brand: Tial
Color: Black
Flange Size: 38mm
Flange Type: V-Band
Includes Hardware: Yes
Includes Spring: Yes, All Springs
Material: Stainless Steel / Aluminum
Pressure Rating: 0.3-1.7 bar
Type: External
Water Cooled: Yes

Mfgr. Warranty: Limited Lifetime Warranty
Condition: New Product
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.




Tial 38mm
awdturbowrx 3 years 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 4 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

2 weeks wg
macarong1988200581739 5 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.
Verified Purchase

Perfect upgrade
errorskimrey 5 years ago
I bought this for my '08 wrx. I have a full invidia headers to catback exhaust so I decided to get this and was also recommended to it by a local performance shop (AWD Tuning). I couldn't be happier. I build boost quicker, hold it better, plus it sounds like a race car now. 316 ft lbs. of torque at the wheel on the stock TD04 pushing 16 lbs!
Verified Purchase

LUMBERZACK 5 years ago
No Boost creep, even line all the way through, could be more happy! Love the variety of springs as well.

  • Q: Tial MV-S connections  Rick D 9 months ago


    Hi, When connecting the air ports and the plugs do you need to use locktite or perhaps thread tape to avoid leaks? I am just not sure if those plugs tightened on their own will hold the air pressure? Any info would be appreciated. Thanks!

    • A: Locktite is not required but can be used. For the most part I used plumber tape.

      Tyler A. 9 months ago
    • A: Thanks. I was going to do that however figured plumbers tape was not designed for the heat the Watergates are subjected to.

      Rick D 9 months ago
  • Q: 16g turbo  awdboichris 1 year ago


    If I'm running a 16g turbo/w e85 will this wastegate be fine?

    • A: There are a bit more variables to look at when choosing a wastegate. Usually for high boost the smaller wastegate would be batter, for low boost a bigger wastegate would be better(like a 44mm).

      Luis L. 1 year ago
    • A: To clarify on Luis' answer, we recommend running the smaller wastegates with smaller turbos, a bigger wastegate with a small turbo such as a 16g would be counter productive. A bigger wastegate such as a 44mm would be better to run with our ATP turbo's or bigger Blouch turbos such as 2.5 XTR, 3076, etc...

      Tyler G. 9 months ago
  • Q: Spring sizes  noeldiazd 1 year ago


    So what's the difference in spring sizes what do they do? I will be going flex fuel along with headers downpipe and catback, 14psi spring ok? What do these springs do?

    • A: Essentially the springs regulate what boost pressure you will run if no boost controller is implemented. The spring pressure is relative to what PSI you want to run. A 14 PSI spring is going to work well for you if you want to run more than 14 PSI with the utilization of a EBCS( Electronic Boost Control Solenoid) or a manual boost controller.

      Jared A. 1 year ago
  • Q: Tial 38mm wastegate  Iker bermudez 2 years ago


    I have an invidia upipe and a stock turbo, my car is not boosting all the way stops pushing around 11lbs , could it be the wastegate not opening? And also will this fit with the indvidia up pipe?

    • A: From what it sounds like is that your wastegate is only running wastegate pressure I would check all of the vacuum lines and boost lines.

      Jared A. 2 years ago
  • Q:   kyronlankford4 2 years ago


    Will this fit my 2004 wrx stock turbo if not what items will I need to make it fit?

    • A: You will need an uppipe with an external wastegate flange (like what Grimmspeed offers). You will also need a bracket to block off your stock internal wastegate. Keep in mind that you will also need a custom tune to run an external wastegate setup.

      Josh P. 2 years ago
Universal Product
This item is non application specific.
Please verify compatibility before purchase. May require some modification for proper installation.