Bov

I went with turbosmart, dual port BOV. Outstanding quality and 0 issues other than a pain in my ass to install lol. (Make sure you have the right tools)

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Focus 2.0L EcoBoost Blow Off Valve

OR

2013+ Focus 2.0L EcoBoost Bypass Valve (Full Recirculation) - Boomba Racing, Inc.

I just installed the Mountune bpv yesterday. Very nice quality piece, direct swap for the stock one, no tune adjustments required.

I have the Turbosmart and love it. Easy install, 30 minutes start to finish.

If anyone has any questions about the Boomba piece, just let us know!

Highly recommend getting an external BOV kit/setup... so much nicer sounds

Here are the cp-e options. A bit more spendy but they do replace one of the weak Ford charge pipes. You can also get them from other vendors with free shipping normally.

Ford Focus ST Exhale? Tial BOV Kit - cp-e?
Ford Focus ST Exhale? HKS BOV Kit - cp-e?

I have the Boomba on mine, Its loud and sounds awesome. As far as installation goes its pretty simple, a nice set of the Long ball end hex sockets make it a lot easier.

The reasons I went with the Boomba BOV for my 2016 Focus ST:
1. Fits in the factory location / easy install
2. Made specifically for the Focus ST
3. Never needs cleaning/adjustment
4. Great sound

Now if you're looking for a BPV, then the Mountune BPV is the best choice out there IMO. Boomba also just released a BPV.

I too have the Boomba BOV and honestly the sound is awesome and the quality is fantastic.

The only other input I can provide other than that all of the brands mentioned above will probably do you the same justice, I just love Boomba's products.

are any of these CARB compliant?

+1 for TurboSmart dual port. The only problem with any bov on this car is they vent ALL THE TIME! Like, -1 psi and I can hear it venting between shifts. It's ridiculous. Hopefully when I re-route the vacuum line to the sound symposer delete it will cut that down some but that's part of the trade off for having a turbo that makes boost at virtually every rpm.

Toadster said:

are any of these CARB compliant?

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releasing Air into the air is BAD!!!! CA will never allow it so I highly recommend not installing this on a car that need CARB compliance!

nickbaldwin86 said:

releasing Air into the air is BAD!!!! CA will never allow it so I highly recommend not installing this on a car that need CARB compliance!

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LOL air into the air

how about BPVs? any improvement going with one of those?

Toadster said:

LOL air into the air

how about BPVs? any improvement going with one of those?

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what do you mean improvement? there isn't "improvement" going to anything. these are 100% noise makers and will not add 1HP or 1/2lb-tq

BPV is what is in the car and a aftermarket is a another piece of metal other than stock doing the same thing.

nickbaldwin86 said:

what do you mean improvement? there isn't "improvement" going to anything. these are 100% noise makers and will not add 1HP or 1/2lb-tq

BPV is what is in the car and a aftermarket is a another piece of metal other than stock doing the same thing.

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meaning will they hold boost longer than stock? or better?

Toadster said:

meaning will they hold boost longer than stock? or better?

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I haven't seen proof anywhere stating that they do. but I have heard of aftermarket ones failing and causing issues. likely from improper installations

I have stage 3 tune on my car with stock BPV. I hit 24PSI many times and it holes throughout the pull. I have been this way for 10k+miles and no issues.

I have also heard of people having issues with the stock one but I haven't seen it and not sure if it was user tampering with it to make it fail.

Thanks everybody

@UnfocusedST had his stock BPV completely tear and fail on him which resulted in a blown turbo.