I'd have one on my '13 too if it didn't already have an Invidia Gemini on it when I bought it.

I have the FI 3" exhaust and it is quite a bit quieter than motordyne or the FI 2.5". I it has a nice tone to it and when you get on the throttle it will open up nicely. You may also pick up a few whp with a 3" exhaust!

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You could simply quiet down the exhaust you have. Take a look at using side branch resonators, it really works and doesn't lower performance.
http://www.the370z.com/intake-exhaus...s-great-8.html

Do you have turbo or supercharger? If you have turbo, is it open dump wastegates? If so that is your issue as to why it's so loud.

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He is supercharged!

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Yes supercharged with an Si trim Vortech, so I'm moving some extra air. Also I'm waiting for TG's A/A kit to show up and air going in can affect the exhaust note a lot so I won't make any decisions until after that's on and see how it is.

But in any case the FI resonated test pipes and Motordyne combo is going to be WAY too loud for me. There is zero drone, rasp or anything like that, it's just the volume that is the issue.

I could also look st replacing the central Motordyne muffler 2@2.5in and 2@3.0out with something else, but then I really wouldn't know what kind of sound I'd end up with beforehand and then I'd be sort of stuck with it.

Love the motordyne exhaust and would hate to see it go but if that ends up being the answer then so be it. Quiet is more important to me right now.

Perhaps there is an armytrix type solution I can cut in as well for a bit more restriction for normal driving and can open the valve for the track. I'll have to look into that a bit further. Kind of the opposite of cutouts I guess lol

I have FI resonated test pipes and FI 18" resonated catback and the drone was getting to me so I added in side branch resonators which made it more bearable and made the exhaust quieter outside.

An option would be to restrict the airflow with small diameter pipes and resonated mufflers but that would probably raise temps and pressure.

I was actually thinking about switching over to Motordyne to eliminate the drone inside the cabin.

If you want to switch exhaust setups let me know.hahaha

I had the Motordyne resonated test pipes with the side branch resonators and the FI exhaust with 18" resonators and it still rattled my head.

The only way to do it is to add in additional mass in mufflers or downstream cats.

My old Comptech exhaust for my RSX had muffler tip inserts to quiet it down.

Looks like I'm going with Invidia. Can't seem to get a Injen into Australia for less than $2K AUD. Can get a local Invidia Q300 for $1.5K.

Absolutely gutted, but the Motordyne has to go. :(

That's a hard realization to come to. The Motordyne is so sweet. Think I'll try some downstream HFC before I make that call.

Those prices are crazy but I guess everything has to be shipped a long way to Oz so it gets expensive. At least you should get a solid return on the Motordyne, not that it's much consolation really.

Hope I can find a way to work with and keep mine. Not giving up just yet!

Already tried downstream HFCs, wasn't enough.

And yea, shipping alone was $550 USD... I'm asking for $1500 AUD, which will be exactly enough to effectively exchange it for the Invidia with no out of pocket loss, but still pissed I have to let the Motordyne go, because sure as **** I don't want to.

That $1.5 to $2K price tag is a hard pill to swallow. Id 100% be going with the CNT before that. It will be tame, cheap and decent quality. I didnt have any fitment issues.

I have the stillen sc with the stillen CBE and stillen's non res test pipes and its no where near as loud as some of the other set ups ive heard

I've got the FI 3" exhaust and they added a set of hfcs in the lead pipes. It's the perfect daily driver volume. It's almost a little too quiet now that the Z is a weekend toy, but the cats will come out with the next round of mods. Granted, I've got turbos to muffle the sound somewhat, so your setup with a SC might be perfect.