An Axle back wont change the noise by much. I've experimented it with two different mufflers and both same outcome. Honestly, It sounds exactly like stock.
If you are looking for noise then just get an Axle and chop off one of the resonators. Thats what I did. No resonators and a straight through muffler and
I'm making 110 DB. Which is loud. The MCG Football stadium with the crowed screaming makes 103 DB. But I have a Varex so it only opens when I want it to
and quiet as stock if Im not in a mood to make noise. Keep in mind this is with the stock 1.75" piping. I can make it heaps louder if I get a bigger pipe but yeah... 110 db is enough..
Js Racing is good and all but I dont see justice spending big bucks on a muffler. Especially on an FD. Try finding a secondhand Js muffler or any other Japanese brand if you want jap. Or look into a Varex Muffler. A Varex Muffler is so handy being able to adjust the volume. I personally wouldn't want to spend $650 on a muffler that wont do much... Performance wise. Before you know it. You'll be spending $850 on this. Installing the muffler is $100 and then you'll realize it made no sound difference and then you'll go chop your resonator off which will cost another $100. Trust man, Im speaking through my experiences and I've told multiple people that changing the muffler alone wont do much and it always ends how I say it will. They're always, "I'll do muffler for now and then see how it sounds." Then less than 24 hours they message me asking how I got mine so loud.
This is mine with only 1 resonator removed. Not as loud as it is currently now but that resonator makes a big difference.
https://www.youtube.com/watch?v=yBe7OZIRECg