Easy install sounds great would buy again

Amazing easy install

Sounds good looks good . Love this product

good parts quality and they ship fast👍🔥

I installed this on my 18 STI, it's pretty straightforward and brings out that BOV sound you want

The car is perhaps slightly slower between shifts, and with an axle back I can definitely hear popping sometimes after letting off

It's probably not ideal considering this is a MAF car, but definitely makes for an exciting drive

Installed the blow off valve on my 2015 sti and was extremely happy with the performance. The adjustability of the valve is key to ensuring the sti doesn’t throw a CEL.

I just bought a 2015 STI after owning a normal WRX, and the first thing I wanted to get for it was a blowoff valve. I didn't modify my WRX at all and haven't done a lot of performance mods outside of exhausts.

After doing some research, I wanted to find a BOV that didn't set off lights on the dash, and that made a great, loud sound. The GFB Respons does just that!!

Super easy install. It took all of 10min. The adjustability part of the valve is cool, although I will always keep it all the way open.

First drive with it was spectacular and I got so excited when I got onto the freeway and flew through the gears!

Definately worth it!! Sounds awesome!!

Fits good went on quick sounds great! Love this one way more then the Perrin! Easy to adjust the sound.

Easy to install, easy to adjust and sounds amazing!

This is such a great bov! Love the sound, turns heads everywhere I go. Really wakes up and livens up my 18 wrx. Installs very easy.....taking the stock valve was super hard. Fyi on the 18 model you will most likely need to buy a small hose clamp. One of the clamps underneath has a tricky clamp that I destroyed to get off lol. And the spring preload will have to be tightend to the make or you till get rpm dropping all the time. So good luck and go ahead and pull the trigger.

Ps I'm running it fully atmospheric

So I have to say this installation turned out to be easier then I expected. The most difficult part was getting the old BPV out. Took a little bit of work but after wiggling it around quite a bit it came out. I elected to remove the intake pipe leading to the turbo to access the position from the bottom of the motor.Tuning the proportioning valve and preload spring was very simple. I set the vavle to 50/50 before I installed the BOV and then screwed the preload spring in approximately 3 - 4 rotations in the + clockwise direction ( to increase load on spring ). You can adjust the BOV from the top of the motor by removing the intake snorkel. Took about 45 minutes from beginning to end. No issues with idle/stall/stumble after high rev's or after shifting under high boost. Holds boost better then stock unit and the WHOOOSSSHHH sound is amazing at 50/50. (My wife compared it to the air brakes on a semi) I'm glad that I made this BOV my final decision. Would highly recommend this product!

2015 wrx bov review:
So upon purchasing I had a performance shop in Connecticut new York named ECS Performance perform the install along with a mishimoto intake and dyno tune. The tuner stated you should not run this unless you have a dyno tune so the car knows what to do with the left over mixture its venting to the atmosphere. Also while trying to run this at 75% recirculate and 25% vent, the vehicle had a stalling issue. The shop stated the spring is not strong enough to close the valve fast enough causing the vehicle to loose all air and stall the car. When we did set it to full recirc they did say I created boost faster then the stock diverter valve but I lost 7 HP because I had to full recirc. Just figured everyone should know what I experienced as they are an experienced and well known shop in new York. Thanks for your products subi speed as I will continue to purchase from you!

I have 2015 WRX Limited. Great BOV and sound. Install was a little more complicated than any other BOV I've ever installed. I had to remove the whole bottom of the intake and the connection to the turbo. It's a little rough trying to get the stock one out and the GFB in. You actually have to push the GFB BOV into a plastic pipe. It's a tight fit, but sounds great. I love how I can adjust it on the fly.

Thanks for the Laffy Taffy! lol