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Digiflavor Siren GTA | Review

Digiflavor Siren GTA | Review

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Siren GTA by Digiflavor

The Siren GTA by Digiflavor, finally the rebuildable tank that MTL vapers have been waiting for.


  • 22 or 25mm versions
  • Single coil design
  • Great for MTL
  • Includes Airflow reducer
Digiflavor Siren GTA

Digiflavor is an offshoot of the well-known and trusted vape brand GeekVape. It seems they are trying to step out of the shadows of the parent company with unique and innovative features not seen before on atomizers.

Digiflavor calls the new Siren a ‘GTA,’ which stands for Genesis Tank Atomizer. It contains an enclosed chimney/chamber and can be filled with e-liquid above the deck level, like an RTA. In truth, the design-features make it an RTA that happens to genesis style wicking, with tails that reach down to the bottom of the tank. The style of the Siren (and Fuji) are intriguing and demonstrate Digiflavor’s creative thinking.

The Siren GTA is available in two different sizes, a 25mm, and a 22mm version. The larger 25 mm version features a stainless and glass chamber so you can see and showcase your coil builds, while the smaller 22 mm just has a stainless steel chamber. Both of the GTAs contain a removable airflow reducer; this allows for the choice of an even tighter mouth-to-lung (MTL) draw, compared to a restricted direct-to-lung (DTL) vape.

2Specs & Features
Digiflavor Siren GTA

Kit Content

  • One Siren GTA
  • One extra glass tank section
  • Two drip tips (one wider bore and one narrow bore)
  • Package of extra post screws and o rings
  • One hex key/screwdriver tool


  • 22 mm (or 25 mm) diameter
  • 43 mm height without drip tip (both)
  • 4 mL capacity for 22 mm GTA (5 mL capacity for 25 mm GTA)
  • Single coil design
  • Removable airflow reducer below coil
  • Two post design
  • PEEK insulators
  • Adjustable bottom airflow ring (4 settings)
  • Top filling design
3Build Quality

Machining/Fit and Finish

The Digiflavor Siren’s much like all Geekvape products are well machined. The threads are super smooth, and all the parts fit nicely together. The one issue I did find was with the airflow reducer. It is a large thumb screw, which’s hard to remove or replace with just your fingers due to the posts being really close to the edges. I found it easier to use a pair of needle nose pliers, and it does require several small turns to accomplish the task. Not a big problem, as I think most won’t be removing and replacing regularly.

Build Deck

Digiflavor Siren GTA

Both versions of the Siren GTAs utilize the same build deck design. These atomizers are solely for single coil builds through the use of two opposing posts. Each post has a notch cut out to slide your coil leads in, which are then secured down by the top mounted Phillips head screws. Beneath where the coil sits is a raised air hole, which helps prevent leaking. Always take care when positioning your coil, so it sits just above it and is not too high to hit the chamber roof, or too low and hits the raised air hole, otherwise it will cause a short.

Wicking the Siren GTA

Digiflavor Siren GTA

After testing different sized diameter coils, I’d recommend using a 3.5 mm inside diameter coil in the 25 mm Siren GTA, and a 3 mm in the 22 mm Siren. This will not only allow you the right space to place your coil but will ensure you have adequate wick sizes to fill the semi-circular wick slots on the deck, and will help prevent flooding. If you make them smaller, you will have less wick which may allow e-liquid to flow up past the wick tails and onto the deck. Also, make sure that you cut the tails of your wicks long enough to touch the bottom of the atomizer, so e-liquid can still be wicked even when your juice level is low. That may sound like a few complex instructions for beginners, but trust me the Siren GTA is an easy atomizer to build on, to wick and to master.

Airflow and Airflow Controller

Digiflavor Siren GTA

The Siren GTA has adjustable airflow via a bottom airflow control ring (AFC), which allows four different settings with the increasing diameter air flow holes. After each turn of the AFC, it clicks into place which is helpful for preventing accidental adjustment.

As mentioned above, each version of the Siren GTA comes with an airflow reducer, which screws into the air hole on the build deck. Using the airflow reducer will create a very tight mouth-to-lung (MTL) vape. However, even without the reducer and on the largest opening, the Siren GTA is still a restricted direct-to-lung (DTL) inhale.


The Digiflavor Siren GTA is a simple top fill tank, simply unscrew the top cap and fill through the large, kidney shaped slots. Refilling may be slightly slower on this GTA design compared to a typical RTA as liquid needs to flow past the centered build deck and chamber before being absorbed by the long wick tails.

Digiflavor Siren GTA

Digiflavor has listened to mouth-lung-vapers calls for a budget priced rebuildable tank and created a great MTL tank in the Siren GTA. It’s capable of an extremely tight draw when used with the airflow reducer, and with the adjustable airflow on the smallest setting. I honestly think even vapers looking for the tightest possible airflow will be extremely pleased with the Siren GTA.

However, if you are looking for a looser direct-to-lung experience, this is not the tank for you. Even without the reducer in place, and the airflow wide open it’s still a tight direct-to-lung (DTL) vape. Instead, you’d be better served looking into Digiflavor’s Fuji GTA, which is available in both single and dual coil versions.

The Siren GTA comes with two delrin drip tips, which are definitely designed with mouth-to-lung vapers in mind. Even the one labeled as “wide bore” is pretty narrow. However, all 510 drip tips are compatible if you are not happy with either.

The Siren is best described as a flavor-centric atomizer. Although cloud production is reasonable and adequate for those who will enjoy it, it is not really on par with the cloud chasing sub-ohm tanks.


  • Easy to wick
  • Suitable for beginners
  • Flavor centered design
  • Great mouth-to-lung draw
  • Included drip tips are Delrin
  • Mess-free top filling


  • Airflow reducer can be fiddly
  • Not suitable for airy direct-to-lung vaping
  • Phillips head screws can strip easily

There isn’t much competition in the mouth-to-lung category of RTA’s, but even if there were the Digiflavor Siren GTA would probably still be top of that list. It really is an excellent flavor producing tank.

It’s also remarkably easy to build on and wick, making it suitable for beginners moving into the rebuildable world of vaping.

If you’re a mouth-to-lung vaper, looking for a rebuildable atomizer with great flavor and restrictive air flow – the Siren GTA is the tank for you.

Build Deck
Build Quality

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Danny Blanton
Danny Blanton
Danny Blanton, a seasoned writer with a decade of industry experience, offers expert reviews on vaping products and cannabis topics, ensuring our readers receive accurate, up-to-date, and valuable insights.
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