Go Fast Bits Respons TMS Blow Off Valve | Multiple Subaru Fitments (T9003)

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Respons TMS Blow Off Valve by Go Fast Bits

On the surface it may look like just another dual-port blow-off valve,but the Respons is actually much more than that. Featuring GFB’s patented venting bias adjustment system, the Respons allows you to precisely control how much air vents from each of the two outlets.

Unlike factory bypass valves, or other brand valves that require different springs for different boost levels, a GFB valve CANNOT be forced open by high boost! The balanced piston design in a GFB valve uses boost pressure on either side to cancel out the forces. Therefore it doesn’t matter how much boost you run, you can be sure a Respons valve will deliver all of it to the engine.

GFB’s TMS (Turbo Management System) principle is based on an operating method that is different to all factory bypass valves. A factory bypass valve is open until required to shut, however a GFB TMS Valve is shut until required to open.


  • Adjust the volume of your blow-off sound
  • Up to 30% faster boost recovery on gearshift
  • Get the blow off sound without the hassles - even on sensitive MAF-based systems
  • Holds unlimited boost pressure


  • 2015-2021 Subaru WRX STi
  • 2004 - 2014 Subaru Impreza WRX STi
  • 2002 - 2007 Subaru Impreza WRX
  • 2005 - 2008 Subaru Forester XT

What's In The Box?

  • 1 - GFB Respons TMS BOV



  • Manufacturer's Warranty

Customer Reviews

Based on 12 reviews
Tyler L.
Exentuated turbo noises ❤️

Couldn't have asked for a better BOV for my wrx. This along with the MAP intake you get every bit of turbo WHOOSH and PSHHHH you could ask for. A+

Odale Atkinson
Good ole psssh - WRX STI 2021

Can't complain, as long as you set the preload spring correctly you'll be fine, amazing sound from both trumpets the original and the whistling trumpet. Currently got mines set to 50/50 with the whistle trumpet, no backfires, no stalls, no low / shaky idle. Before installing it I'd suggest looking at the action when its set to full vent / full recirculate this way you can see how to actually set it, I've marked mines so I know when I'm 100% venting vs venting and recirculating , it also doesn't have to be exactly 50/50 you can set it more towards recirculate and a little bit to vent (as I said before installing it just check it out first)
As the rest said get rid of that clamp because putting it back on was a pain. Some long needle nose pliers with a slight bend will do you good!
No gasket needed as well as theres a o-ring on the flange.
Shipping was crazy fast as well, MA Performance always delivers!

Beau Koren

This BOV is perfect. You do not need a tune as long as you have minimal mods done. I have a 2020 STI with a Remark cat back exhaust (non resonated) and a Mishimito Performance Intake. With these mods, my car is experiencing increased airflow, therefore you do have to mess with the spring load adjustment to get your car to return to idle normally, unless your STI is completely OEM/Stock. Per GFB, the spring load is preset to engine idle vacuum. This product will provide the BOV sound desired, as well as some nice pops and bangs. This BOV will help eliminate any sort of rev hang as well.

cool BOV

y'all go for this boy its worth it in every pennies


I got it for my 2019 wrx sti, along with the invidia r400, I didn't get the exhaust from ma they were on back order and I didn't want to wait, so I payed a little more and got it somewhere else, but I'm happy with both, the car sounds great now, Haven't had any bad effects from the car, no cel or anything so far, it's been on for a few weeks, I agree with the other review that says to change the stock hose clamp, it took me forever, it was a hassle to get it unlocked to close, I dropped one of the mounting screws and had to pull the bov back off to get it out, I didn't like fighting that hose clamp, so I changed it