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Armytrix Valvetronic Exhaust - I took the plunge


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#1 The Stig

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Posted 17 August 2013 - 05:15 PM


Hi folks, I’ve been debating a variable volume exhaust for the last little while and finally decided to bite the bullet. I perused the usual suspects - Agency Power and AAM - and they both make quality pieces, but I was quite intrigued by MEGTROC Admin ‘Q’s post about Armytrix. I checked out their youtube clips and website (http://armytrix.com), and after speaking with them on multiple occasions, I decided to take the plunge on their variable volume catback exhaust.

As a complete set they offer catless downpipes, a resonated catless midpipe, and the variable volume exhaust. Given that I already have GTC cast iron downpipes, and a Cobb catted midpipe (I can’t stand the smell otherwise), I decided to go with the variable volume exhaust alone. I know a lot of you run similar bolt-on setups either with or without a catted midpipe.

It’s remote controlled with hydraulic actuators, and what I like about it is that irrespective of whether the valve is open or closed, it flows through all 4 tailpipes (you can see in the photos below). Also, you can select open, closed, or have it automatically open at a set RPM level, which I think is a useful feature.

I ordered it from them on August 12th, and it arrived August 13th. Yeah, that was pretty darn awesome.

I’ve taken some pictures of it sitting in my living room (forgive the rug) and will take more pictures and videos/sound clips when I have it installed this Wednesday. I'll give a full review of the exhaust sound and performance once I have it on there, so hopefully it’ll be helpful for others considering variable exhausts as well.

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Edited by The Stig, 17 August 2013 - 05:22 PM.

Some say that I break into people’s houses at night and leave two mysterious extra keys in a kitchen drawer.

And that as a result of buying Pirelli condoms this week, I now have seventeen children.

All we know is, I'm called The Stig

#2 acuteperformance

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Posted 17 August 2013 - 05:17 PM


Very nice rug!

#3 fricks

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Posted 17 August 2013 - 06:16 PM


Would love to know what you think of this exhaust. I was thinking about picking it up as well

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| Akrapovic Titanium Slip On, HKS Resonated, AMS Catless DP, ID1300, Gotboost 3in Intake, EcuTek FlexFuel |
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#4 choester

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Posted 17 August 2013 - 08:54 PM


Closed, would this be quieter than stock? I'm looking for ways to reduce the noise after going catless DP/MP. Pretty sure my neighbors hate me.
2010 GT-R e85 bolt-ons

#5 The Stig

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Posted 18 August 2013 - 12:38 AM


Very nice rug!


Lol thanks!

Would love to know what you think of this exhaust. I was thinking about picking it up as well


Will definitely post up my impressions as well as sound/video clips.

Closed, would this be quieter than stock? I'm looking for ways to reduce the noise after going catless DP/MP. Pretty sure my neighbors hate me.


That's an excellent question, I'll let you know more after Wednesday. The muffler certainly looks a good size. One other option for you if the car is too loud even on the stock exhaust would be to consider an HKS resonated midpipe, those seem to do the trick for noise suppression.
Some say that I break into people’s houses at night and leave two mysterious extra keys in a kitchen drawer.

And that as a result of buying Pirelli condoms this week, I now have seventeen children.

All we know is, I'm called The Stig

#6 kaliturbo

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Posted 18 August 2013 - 10:35 AM


Subscribed.

#7 Canopy

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Posted 18 August 2013 - 12:29 PM


In for review.
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#8 Cavalier777

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Posted 18 August 2013 - 02:20 PM


let us know how reliable it is. switchables are known to fail pretty consistently AFAIK. would be great to have a reliable choice finally.

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#9 familydoc

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Posted 18 August 2013 - 02:42 PM


There is just way too many things going on with these "valvetronic" exhaust systems.

I do it for the flow and weight savings. These systems defeat the purpose.

#10 The Stig

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Posted 18 August 2013 - 02:55 PM


There is just way too many things going on with these "valvetronic" exhaust systems.

I do it for the flow and weight savings. These systems defeat the purpose.


But that's not their purpose at all.

If you modify your car for flow and weight savings, a valvetronic exhaust is not what you want, it's mainly for us that desire adjustability of volume.
Some say that I break into people’s houses at night and leave two mysterious extra keys in a kitchen drawer.

And that as a result of buying Pirelli condoms this week, I now have seventeen children.

All we know is, I'm called The Stig

#11 The Stig

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Posted 18 August 2013 - 03:01 PM


let us know how reliable it is. switchables are known to fail pretty consistently AFAIK. would be great to have a reliable choice finally.


Definitely will, I had read that a different brand had some issues with electronic actuators on their earlier versions, so that's something I'm keeping in mind. It should get a pretty good workout as I plan to run it in Auto mode for a while, so the valve will be used a fair amount.
Some say that I break into people’s houses at night and leave two mysterious extra keys in a kitchen drawer.

And that as a result of buying Pirelli condoms this week, I now have seventeen children.

All we know is, I'm called The Stig

#12 bobmirko

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Posted 18 August 2013 - 03:13 PM


There was lot of problems with the electric actuators. Apparently the vaccum unit is more reliable.

#13 Tman

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Posted 18 August 2013 - 05:48 PM


.Peter, that's awesome! 1 day delivery? That's phenomenal!
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#14 krea.tion

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Posted 18 August 2013 - 05:57 PM


Looks like a very quality piece!
2012 GT-R (AMS DP, AAM catted midpipe, GotBoost 3" intakes, Cobb AP tuned by Ben@GTC, GFB Respons BOVs) SOLD
2009 Yamaha R6 Race Bike (Graves full race exhaust, PowerCommanderV, Ohlins 30mm fork cartidges, Ohlins TTX36 MKII shock, Hyperpro damper, Braking WK rotors, Fren Tubo carbon lines, EBC GPFA pads, race requirement goodies)
2006 Suzuki GSXR600 Race Bike (Akropovic full race exhaust, Bazzaz ZFI-TC, head porting, Ohlins 25mm fork cartidges, Ohlins TTX36 shock, Ohlins damper, Galfer Wave rotors, Galfer SS lines, EBC GPFA pads, race requirement goodies)
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#15 Cavalier777

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Posted 18 August 2013 - 07:31 PM


Definitely will, I had read that a different brand had some issues with electronic actuators on their earlier versions, so that's something I'm keeping in mind. It should get a pretty good workout as I plan to run it in Auto mode for a while, so the valve will be used a fair amount.


Awesome.

BTW, I think it would be beastly to have the auto set to open at high RPMs. Almost having a sound barrier (mach) illusion since the car goes fast silently... and then BANG the sound happens. :) :thumbsup:

Edited by Cavalier777, 18 August 2013 - 07:32 PM.

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#16 The Stig

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Posted 23 August 2013 - 02:37 PM


Hi folks,

Well the exhaust is finally installed, I did it at the local Nissan dealership who did a great job. First impressions are positive! Again, this is with catless GTC downpipes and a Cobb catted non-resonated midpipe. By the way, when I refer to "stock exhaust" below, I mean the stock catback portion along with the aftermarket downpipe/midpipe, and not an entirely stock exhaust.

It's definitely a much different sound than it was before - much more of a lower pitch rumble quality, that extends through the first three or 4000 RPM. It's has a nice growl/rumble to it, a more low frequency "solid" sound, something of a cross between a boxer engine and a V-8 is the best that I can describe it. After that it turns into the typical high-pitched GT-R wail, but with a bit more rumble to it. I found the stock exhaust has more of a boominess across all frequencies and a bit of a drone. To me the Armytrix sounds more "refined". With the exhaust valve is closed, it's definitely quieter than stock, and no drone at either city or highway speeds. It'll definitely keep anyone with sensitive ears happy.

Volume wise, even when open I think it feels a touch quieter than the stock exhaust at lower rpms. That could just be a function of the supression of the louder more "droney" noises. At WOT at higher RPMs it certainly feels as loud if not louder than the stock exhaust. I used to wear earplugs in the car, and now even with the exhaust open, I don't feel the need to. I think it's to do with the "cleaning up" of the frequencies and boominess of the stock exhaust. Overall I'm very happy with the sound. I haven't had a chance yet to try the Auto feature, but will do so tomorrow. The switches seem to work perfectly, it's a vacuum actuator, so hopefully that will bode well for the longevity.

Here are some pics of the installation taken by the mechanic. I'll be doing some videos over the weekend that hopefully will give a better sense of the sound.

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Edited by The Stig, 23 August 2013 - 04:19 PM.

Some say that I break into people’s houses at night and leave two mysterious extra keys in a kitchen drawer.

And that as a result of buying Pirelli condoms this week, I now have seventeen children.

All we know is, I'm called The Stig

#17 Rguy

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Posted 23 August 2013 - 02:42 PM


Whats the cost on this piece?

#18 The Stig

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Posted 23 August 2013 - 03:33 PM


Armytrix Valvetronic Exhaust + Titanium Blue Tips = $3,550
Some say that I break into people’s houses at night and leave two mysterious extra keys in a kitchen drawer.

And that as a result of buying Pirelli condoms this week, I now have seventeen children.

All we know is, I'm called The Stig

#19 jmunjr

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Posted 23 August 2013 - 04:08 PM


You were wearing earplugs with the stock exhaust? Hard to gauge the sound of this thing when gramps is doing the review :P

Edited by jmunjr, 23 August 2013 - 04:08 PM.

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#20 The Stig

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Posted 23 August 2013 - 04:14 PM


You were wearing earplugs with the stock exhaust? Hard to gauge the sound of this thing when gramps is doing the review :P


Hahahaha!! :biggrin:

I have very sensitive hearing, so it gets a bit uncomfortable for me. But in fairness it's with catless downpipes and aftermarket catted non-resonated mid, along with the stock exhaust, so it wasn't entirely stock :wink:

Edited by The Stig, 23 August 2013 - 04:15 PM.

Some say that I break into people’s houses at night and leave two mysterious extra keys in a kitchen drawer.

And that as a result of buying Pirelli condoms this week, I now have seventeen children.

All we know is, I'm called The Stig



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