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Digiflavor Siren 2 GTA MTL | Review

Digiflavor Siren 2 GTA MTL | Review

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Digiflavor Siren 2 GTA MTL

Digiflavor have added an easy to use top cap and an innovative airflow control to help provide a great MTL experience.


  • Innovative top cap
  • Great Flavor production
  • Excellent airflow options
  • Two versions available
Digiflavor Siren 2 GTA MTL

For quite a long time mouth to lung vapers have been neglected in the rebuildable market. However, at the turn of the year, Digiflavor released the Siren GTA with great success, and recently a few other companies have followed suit.

Now Digiflavor is back with an updated version of the Siren, this time with a little help from some friends. Vaping with Vic, along with three other YouTube reviewers had a helping hand in designing the new Siren 2, so I’m looking forward to seeing what improvements they have made on an already great MTL RTA.

Note: We were sent The Siren 2 GTA MTL directly from Geekvape/Digiflavor for the purpose of this review.

2Specs & Features
Digiflavor Siren 2 GTA MTL


  • Height: 44 mm without drip tip | 41.5 mm (TPD version)
  • Diameter: 24 mm or 22 mm (TPD version)
  • Capacity: 4.5 mL or 2 mL (TPD version)
  • Colors: Gunmetal, Blue, Black, Stainless Steel

Kit Contents

  • 1 x Siren 2
  • 1 x Spare glass
  • 1 x Allen Key
  • 1 x Spare parts polybag (including different colored o-rings)
  • 1 x User manual
  • 2 x Coils
3Build Quality & Design
Digiflavor Siren 2 GTA MTL


There are two versions available of the Siren 2. The first has a 24mm diameter and 4 ml capacity; then the TPD compliant version has a 22 mm diameter with a 2 ml capacity. Both come in a variety of colors from the standard stainless steel and black, to the more striking blue and gunmetal.

We received the gunmetal versions, and the matte silver/grey finish immediately caught my eye. There is a laser-etched Siren logo on the build deck housing and some subtle little engravings on the top cap (which help with grip). It’s a really understated stunning design that is only let down by the goofy looking long drip tip with a white plastic tip. I know mouth to lung tanks are better suited to these style drip tips, but I only wish they went with a different color tip to keep the sleek overall look.

However, taste is subjective of course, and others might disagree with me.

Build Quality

The overall build quality as expected from Digiflavor is also very impressive. All threading is super smooth; the airflow ring is not too loose and not too tight, it’s easily adjustable without being able to move freely in your pocket. I’ve also had no issues with any of the o-rings.

Digiflavor has gone with a redesigned top cap, which I expect we are going to see some more of in their (and GeekVapes) new tanks – and it is an excellent addition. The top fill cap contains two notches on the center base that slot into the top air hole of the tank, all backed by a solid rubber grommet to prevent any leaking. It’s incredibly easy to open with just a simple quarter turn counter-clockwise and to replace the top cap you don’t even need to look where you are placing it as you can feel notches catch and a quarter turn anti-clockwise will have you locked up and ready to vape. It definitely doesn’t feel like it is going to pop off in your pocket accidentally, and I have had no leaking issues whatsoever – I’m a big fan of the new design.

Build Deck

Digiflavor Siren 2 GTA MTL

The Siren 2 has a GTA style build deck, much like its predecessor. It is a simple two-post style deck designed for single coils and is easy to build on. Each of the posts uses flathead screws and have been easy to turn and catch the wire. You need to make sure when building your coils that both legs are at an equal level, as the slots for the wire in the deck are also equal height. The wicking slots are like the previous Siren; they are well-milled with no sharp edges and easy to position your wicks in.

The airflow hole is positioned just below where the coil sits, which will allow the air to come up straight under the coil. Being a GTA style deck means the vapor doesn’t have much distance to travel before it reaches the drip tip which means optimal flavor.

The Airflow Control

Digiflavor Siren 2 GTA MTL

This is the airflow I’ve been waiting for on an MTL RTA tank. Digiflavor has knocked it out of the park with this one and covered every type of MTL vaping with the airflow options. Much like the Aspire Nautilus 2, you have five different-sized airflow holes. You can then slide the wide airflow slot to open or close each how however you wish; there are no click stops so you have plenty of options. There is also a single hole that allows you to have the holes open individually for a more precise draw.

The Siren 2 GTA really a fantastic customizable airflow, something every MTL vaper will appreciate.

Digiflavor Siren 2 GTA MTL

The Digiflavor comes with 1.0 Ohm pre-built coils, which are 2.5 mm inner diameter, SS316 coils, which are six and a half wraps and slightly spaced. I’m going to discuss my experience with the performance with these coils as that’s the resistance that I’d mainly vape MTL.

As with most GTA tanks, you do have to be a little cautious with the wicking. I line the wicks up with the deck and cut just below, then give it a bit of e-liquid to make it easier to tuck the ends into the wicking slots. Nevertheless, I tried vaping the Siren 2 with both a 50/50 and a 70/30 juice and had no wicking issues whatsoever it kept up admirably even with the thicker juice. All in all, there was no spit back, no gurgling or leaking, no matter what I did with the tank.

I do advise that it’s best to close the air holes when filling just to ensure you get no leaking when the pressure changes as you replace the top cap.

How does it vape?

Just so you can better understand the differences in the airflow options, I’ll detail my experience below with the varied airflow settings:

  • Smallest hole – Very tight draw, and warm vapor
  • Two holes – Cigarette-style draw with warm vapor
  • Three holes – Still a tight draw, vapor starts to get a bit cooler
  • Four holes – Looser draw, with cool vapor
  • Five holes – Perfect for me, a looser MTL draw. It could possibly be used for a restricted lung hit

There is also the option of using it with the single hole airflow; I did, however, find them to either be comparable to the tight options above on the largest setting, and a little too tight for my liking on the smallest hole settings. However, it certainly does give you greater range on tight draws if that’s your style.

The Siren 2 won’t allow you to blow huge clouds, that’s not what it’s designed for. However, the cloud production, especially with the 5 holes open, was admirable. I found in almost all airflow settings the flavor produced was excellent the best yet from an MTL RTA, and above everything else, the airflow is astonishingly smooth and silent.


  • Easy to build & wick
  • Easy to remove top cap
  • Great flavor
  • Excellent build quality
  • Fully adjustable airflow
  • Affordable price
  • TPD compliant version available


  • High profile design (44 mm)

I’m first and foremost an MTL style vaper, and I have to say I’ve tried most of the rebuildable MTL tanks on the market and the Digiflavor Siren 2 GTA MTL is without a doubt my favorite.

There are some other great MTL rebuildables out there, and it’s great to see MTL tanks emerging in the market again. But if you are looking for a stylish MTL tank with incredibly versatile airflow options, consistent performance and great flavor production you can’t go wrong with the Digiflavor Siren 2.

The Siren was already a great tank, but I think the guys that have assisted designing and tweaking the Siren 2 have helped take it up that extra gear and is certainly going to take some special to overthrow this from the best MTL vapes list.

Build Quality
Build Deck

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Jules Martinez
Jules Martinez
Jules Martinez, co-founder and Editor-in-Chief of our vaping site, brings a decade of expertise in vaping, CBD, and cannabis. His comprehensive knowledge and editorial rigor ensure high-quality, accurate content, positioning us as a trusted resource in the community.
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