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

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

Manufacturer Part # MVSB


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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RallySport Direct is proud to carry the Tial MV-S 38mm External Wastegate in the blue finish.

Tial MVS(38mm) Wastegates feature a High temp NiCrFe based alloy is used for valve and 347SS valve housing will offer longer product life, high-temperature silicone Nomex reinforced actuator diaphragm, 17-7 PH Stainless Steel actuator spring gives consistent pressure at high temperature, resist "relaxing" at temperature to 900°F (483°C), Nitronic 60 Stainless Steel is used for the valve seat, and valve bushing, all Stainless Steel hardware, mating weld flanges are 304L. As well as 3 lower ports and two top ports for easy install, no need to rotate the actuator top at all, plugs included for unused ports, an ultra-compact design fits in very tight spaces, the unit stands only 3.7" tall, more compact than any other external wastegate on the market today and a V-Band inlet and outlet make installation easy.

Sometimes springs come pre-installed from Tial so you will want to verify the spring settings before installation.

  BAR PSI DESCRIPTION O.D. 0.3 4.35 Green 1.125 in 0.4 5.80 Red 1.500 in 0.5 7.25 Yellow 1.125 in 0.6 8.70 Black 1.875 in 0.7 10.15 Red + Green   0.8 11.60 White + Green   0.9 13.05 Black + Green   1.0 14.50 Black + Red   1.1 15.95 Blue + Yellow   1.2 17.40 Black + Blue   1.3 18.85 Black + Red + Green   1.4 20.30 White + Blue + Green   1.5 21.75 Black + Blue + Green   1.6 23.20 White + Blue + Yellow   1.7 24.6551 Black + Blue + Yellow  
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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.



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

2 years ago
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.
Verified Purchase

Great mid range ewg
Pineappledood 3 years ago
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

Awesome item
chris8889m89419 3 years ago
Amazing sound and great quality.
Verified Purchase

Great Wastegate
Castper 4 years ago
This thing is awesome, works well and I have had no problems with it. Sounds amazing in my WRX.
Verified Purchase

Tial 38mm EWG
ThatBoxerGrowl 6 years ago
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!

  • Q: Spring set up tial wastegate   White__sti 2 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?

    • A: You'll want to consult your tuner for the best spring to run with your setup.

      Marcus E. 12 days ago
  • Q: Tial 38mm bov  hfrohlich5 2 months ago


    Will the tial 38mm bov fit on my stock 2005 wrx?

    • A: Since this is a universal part we cannot confirm fitment.

      Devan M. 17 days ago
  • Q: Wastegate   RallyBlueSTI 2 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?

    • 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. 2 years ago
  • Q: Spring psi  100plus2vegas 3 years ago


    Is it true that your overall psi is double the spring psi? I'm currently running about 18.75psi on my stock turbo on a 14 wrx ej255. Would this 38mm waste gate be a better choice than the larger 40-45mm waste gates? Thanks.

    • A: The spring PSI should be the same as the boost pressure, and you can raise the boost higher than the spring rating with a boost controller. Wastegate sizing depends on how much exhaust needs to be vented and if you are running 17+ PSI on the stock turbo, then this EWG would work well because you don't need to vent much exhaust.

      Zach G. 3 years ago
  • Q:   scoobydoo14 3 years ago


    Will I need an aftermarket up pipe to run this? Or will it fit with the oem up pipe?

    • A: External wastegates are not compatible with the stock uppipe, and you will need an uppipe with a 38m EWG flange.

      Zach G. 3 years ago
Universal Product
This item is non application specific.
Please verify compatibility before purchase. May require some modification for proper installation.