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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 06-09-2021, 05:16 AM   #127
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Quote:
Originally Posted by gpvecchi View Post
Some times ago I fitted the STi JDM axleback, instructions said to replace nuts, gasket, and hangers, but I didn't do it as my car was new.
I was happy with the sound, except an annoying resonance at 3000 rpm.
I asked here, and I was said it was drone, nothing to do, characteristic of the exhaust; it was not drone to me, but a resonance inside the cabin.
Recently I discovered a japanese article: I was right, and I made a great mistake.
I didn't check the part numbers of the additional parts, as I took for granted that they were the stock ones; but the hangers weren't, they were a different part number!
The article said that the cabin resonance frequency of the 86/BRZ is 125 Hz, and the STi steel exhaust (the titanium one don't) needs that specific hangers to avoid the noise. AND THIS WORKS!
If you have resonance, and you want to try risking just few bucks, you have to replace just the 2 rear hangers (the ones toward rear bumper) with 44066AJ010 part number. The front ones has to remain stock.

Were you able to check the weight of the muffler vs stock? How's the sound from the inside the cabin & outside? Was it worth it to spend about 2k on the STI than the others that are about 50% cheaper (if you factor in import taxes & shipping)? Is the midpipe included too?

I used to have the TRD Exhaust on my FRS & it was a bit loud to my liking & droney too.
TIA
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Old 06-09-2021, 05:56 PM   #128
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Sorry, I can't check the weight as it's fitted. STi exhaust is an axleback. The outside sound is perfect, beefy, not too silent and not too noisy.
The inside sound is meh, at lower revs it's a little strong, in particular around 3000 rpm (but I think every exhaust will be noticeable at that rpm), quite silent at higher revs.
It worth the price if you care of the brand STi, it's particular construction and its wonderful exit pipes. Plus, this exhaust has a quiet and wonderful noise when catless...
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Old 06-09-2021, 08:41 PM   #129
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My understanding (happy to be corrected) is that the Fujitsubo Authorize S is a nearly identical axle-back to the STi. I haven't seen the two side by side, but the photos of each make it seem true.
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Old 06-09-2021, 09:11 PM   #130
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My understanding (happy to be corrected) is that the Fujitsubo Authorize S is a nearly identical axle-back to the STi. I haven't seen the two side by side, but the photos of each make it seem true.
They're quite different IMO. The STi is a flow-through resonator that goes into into a small chambered silencer - all packaged neatly into the dimensions of the stock muffler. While the Authorise S is just a big chambered silencer.

From the various sound clips I've seen. The STi has more bass and growl, while the Authorise S is more plain in its tone.
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Old 06-10-2021, 03:21 PM   #131
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They're quite different IMO. The STi is a flow-through resonator that goes into into a small chambered silencer - all packaged neatly into the dimensions of the stock muffler. While the Authorise S is just a big chambered silencer.

From the various sound clips I've seen. The STi has more bass and growl, while the Authorise S is more plain in its tone.
Some more thoughts on how those two compare.
The Authorize S sounds like the stock muffler uncorked - a little bit louder and clearer tone but still very much the same plain character of the stock exhaust.
The STi muffler has a more distinct character to it. More refined, very deep tone, not raspy or tinny.
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Old 06-11-2021, 07:55 AM   #132
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That's good info. Have you been able to find sound clips online to compare? Bonus points for catless UELs...
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Old 06-11-2021, 09:47 AM   #133
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That's good info. Have you been able to find sound clips online to compare? Bonus points for catless UELs...
This playlist I put together:
https://youtube.com/playlist?list=PL...8kCS1eQkBLXS5J
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Old 06-14-2021, 05:35 AM   #134
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Received my hangers a few days back, will report once I get the chance to install them.
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Old 06-14-2021, 10:21 AM   #135
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Discovery on STi JDM axleback and perhaps others

Finally able to report back in brief, as I installed all 5 on my car a few days back while pulling it out of winter storage (a little late, I know). Took 10 minutes with a can of WD40 to help wrestle the stock hangers off.

For reference, my exhaust setup:
- JDL 4-2-1 EL Header
- Stock OP/FP
- Invidia R400 cat-back

This setup is far from the loudest but it is not quiet when you are on throttle. Under low load it remains basically as quiet as stock in the city, but on the highway especially going up hills (where mild load is introduced) I was getting drone right in my cruising speed of 120-130kph (3400-3600rpms-ish).

I’m actually alarmed at how much of a difference these hangers make. The volume of your exhaust is still there (obviously), but with literally none (!) of the cabin resonance and drone, which makes it so much more livable, especially on the highway.

I was going to add an additional resonator to my setup or swap my catback to quell my drone issues on the highway, but with this quick fix, I don’t have to anymore.

Thanks to @gpvecchi for sharing this with the community!

PS: To any one concerned about exhaust movement with these hangers, I actually had some midpipe movement with my stock hangers that I could hear when entering driveways (midpipe touching the tunnel). With these new hangers installed, that movement is gone.
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Old 06-16-2021, 01:23 PM   #136
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Based on the posts in the thread, I ordered a set. I've got some annoying resonance with the Legsport "Race" exhaust and if it helps get rid of that its worth a shot. I'll post an update with my opinion once I have the parts installed.
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Old 06-18-2021, 01:18 AM   #137
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Decided to be proactive and order a set of these for when the exhaust mod happens. It's too inexpensive a thing to not try. Took a little over 2 weeks from ordering for them to ship, not too bad at all.
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Old 06-19-2021, 04:55 PM   #138
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Really glad I stumbled on this thread. Just installed the 3" Perrin Resonated catback this weekend and noticed quite a jump in cabin vibration. Chalked it up to the blown cat in my OEM front pipe (unfortunate discovery when taking off the stock muffler and still need to address). Really confident this will help, but probably won't see it for at least a month.
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Old 06-22-2021, 01:31 PM   #139
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My exhaust recording on outside..
Interior wise, it tuned out a lot of the unwanted frequency, resulting in a better cabin cruise... from time stamp 2:50 onwards, noise interior wise was the quietest at 3.5k rpm as it had the best cancellation

ymmv though as mine is a full titanium catback

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Old 06-22-2021, 11:14 PM   #140
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Quote:
Originally Posted by gpvecchi View Post
Some times ago I fitted the STi JDM axleback, instructions said to replace nuts, gasket, and hangers, but I didn't do it as my car was new.
I was happy with the sound, except an annoying resonance at 3000 rpm.
I asked here, and I was said it was drone, nothing to do, characteristic of the exhaust; it was not drone to me, but a resonance inside the cabin.
Recently I discovered a japanese article: I was right, and I made a great mistake.
I didn't check the part numbers of the additional parts, as I took for granted that they were the stock ones; but the hangers weren't, they were a different part number!
The article said that the cabin resonance frequency of the 86/BRZ is 125 Hz, and the STi steel exhaust (the titanium one don't) needs that specific hangers to avoid the noise. AND THIS WORKS!
If you have resonance, and you want to try risking just few bucks, you have to replace just the 2 rear hangers (the ones toward rear bumper) with 44066AJ010 part number. The front ones has to remain stock.
@gpvecchi do you still have that article you were referring to? Would like to do a read if you still have it.
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