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Tial MV-S Wastegate 38mm Blue w/ All Springs (Part Number: )
Tial MV-S Wastegate 38mm Blue w/ All Springs (Part Number: )
Tial MV-S Wastegate 38mm Blue w/ All Springs (Part Number: )
Tial MV-S Wastegate 38mm Blue w/ All Springs (Part Number: )
Tial MV-S Wastegate 38mm Blue w/ All Springs (Part Number: )
Tial MV-S Wastegate 38mm Blue w/ All Springs (Part Number: )
Tial MV-S Wastegate 38mm Blue w/ All Springs (Part Number: )
Tial MV-S Wastegate 38mm Blue w/ All Springs (Part Number: )
Tial MV-S Wastegate 38mm Blue w/ All Springs (Part Number: )
Tial MV-S Wastegate 38mm Blue w/ All Springs
Read 6 Reviews | 22 Q&As
Part # 002952
msrp: $339.00

In stock! Ships same day
Universal part

Features & Product Details

RallySport Direct is proud to carry some of the best aftermarket turbocharged components brought to you by Tial.

Here, you are looking at the Tial 38mm MV-S External Wastegate. This wastegate is a very popular choice of external wastegate utilized by some of the world's fastest and powerful turbocharged vehicles. The 38 MV-S supersedes the previous Tial V38 in design with new features to achieve your desired boost levels.



  • Water cooling ports (not required to run) for those heavy-duty applications, three bottom pressure ports and two top ports for boost controllers like the AMS-1000.
  • High temp NiCrFe based alloy is used for valve and 347SS valve housing will offer longer product life compared to competing designs.
  • High-temperature silicone Nomex reinforced actuator diaphragm.
  • 17-7 PH Stainless Steel actuator spring gives consistent pressure at high temperature, resist "relaxing" at a temperature to 900F (483C).
  •  Nitronic 60 Stainless Steel is used for the valve seat, and valve bushing.
  • All Stainless Steel hardware.
  • Mating weld flanges are 304L
  • Includes all of the springs so you can tune it to your cars needs without spending money on extra springs
  • Springs come pre-installed from Tial  so you will want to verify the spring settings before installation
  • Blue finish
  • Includes all springs for you to reach the desired boost levels of your preference
  • Specifications

    Brand: Tial
    Color: Blue
    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.



    6 Reviews
    5 out of 5 Stars
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars
    Customer Photos and Videos
    No user media. You can upload a photo or video of your install by posting a review.
    Awesome! 3 years ago
    5out of 5stars

    This thing is LOUD! I have this coupled with the grimmspeed uppipe and it sounds amazing. Gained about 10whp 15trq after mustang dyno tune. Holds boost well and does seem to make turbo spool up a wee bit faster. Be warned again. It is loud. U probably dont want to show it off if/when there is a cop near by or even a one block radius of you. Only opens up at wot. But it does sound amazing. And very addicting. Until you pass the honeymoon stage. Then it can get annoying. I just tell people its my vtech is kicking in hard. Videos do no justice on how amazing this sounds and did I mention how loud it is? Great product and made in the USA. Awesome.
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    Great mid range ewg 3 years ago
    5out of 5stars

    Good product relatively easy install. I didn't realize how bad of shape my iwg was until I put this thing on. Now my turbo spins up like a top with no waste gate flutter. According to my tuner I'm also hitting peak boost around 500 rpm quicker. I'm only running 17psi but judging the overall quality of the product I'm sure it could handle pretty much any amount of boost you throw at it especially if you took the time to run lines to the included water cooling ports (which is totally unnecessary unless it's on a legit race car) Note: be sure to triple check when YOUR ewg came out so you can positively be using the right spring chart on tials website
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    Awesome item 4 years ago
    5out of 5stars

    Amazing sound and great quality.
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    Great Wastegate 5 years ago
    5out of 5stars

    This thing is awesome, works well and I have had no problems with it. Sounds amazing in my WRX.
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    2 of 2 people found the following review helpful
    Tial 38mm EWG 6 years ago
    5out of 5stars

    After installing this with the Grimmspeed uppipe and getting it dyno tuned I picked up another 40 hp and 35 lb/ft at the wheels. One of the best power adders for the money I've seen so far!
    Was this review helpful?


    • Q: Tial ewg 38mm or 44mm  PatrickDC3 months ago

      I have VF48, 650cc injectors 255lph on my 03 wrx but idk which mm should I get ?
      • 0 of 0 people found the following answer helpful

        A:  Because there are other factors to consider when choosing an EWG setup, please feel free to give us a call so that we can talk more about your setup 801-748-4910

        Karsten B. @ RallySport Direct 3 months ago  
        Was this answer helpful?
    • Q: 38 or 44  Josh6 months ago

      I have a 2014 wrx. Stock turbo, Invidia catless downpipe and dual n1. Plan on installing an electronic boost controller. Which size wastegate should I use?
      • 0 of 0 people found the following answer helpful

        A:  Hi, Josh, with a stock turbocharger in place, you would have plenty of additional flow capability with the TiAL MVS (38mm) wastegate, well past the limit of that stock turbo.

        TiAL @ Tial 6 months ago  
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    • Q: Spring set up tial wastegate   White__sti11 months ago

      I need help on setting up the springs for my 38mm tial wastegate on my 2011 STI Do i set the springs to the sport mode boost pressure or the sport # boost pressure ? I’m currently running 16psi on sport and 20psi on sport# I’ve heard to do the higher boost pressure but I’ve also heard to do the lower one?
    • Q: Tial 38mm bov  hfrohlich511 months ago

      Will the tial 38mm bov fit on my stock 2005 wrx?
    • Q: Wastegate   RallyBlueSTI3 years ago

      I have a 2013 STI with the Invidia Catless Divorced Wastegate downpipe along with a pro tune. Will this wastegate be compatible with my downpipe? and if so, how much HP and torque will I gain?
      • 0 of 0 people found the following answer helpful

        A:  The wastegate is installed before the turbocharger either on an uppipe modified for a wastegate or on an exhaust housing of the turbine if you have a turbocharger that allows for that. The downpipe is not going to effect fitment.

        Nick S. @ RallySport Direct 3 years ago  
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    This Part Fits

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