HKS single exit cat back exhaust drone!!!
 

Hey guys, i just bought my first 86 not long ago, and i've installed the HKS single exit cat back exhaust on the car, the exhaust sounds really good from the outside and not too loud which's good for where i live, the thing is it drones a lot especially at around 3k rpm.

I currently have both my header and front pipe stock, so im wondering if the drone will be reduced if i get the hks dual resonator front pipe, if not, guess ill have to let this great sounding exhaust go. :sigh::sigh::sigh:

I honestly don't believe anything will reduce drone better than the stock front pipe. Unless you weld more catalytic converters onto it to replace all that useless empty space between the pipe walls

This one?

https://cdn.shopify.com/s/files/1/08...g?v=1573756168

yes sir, this is the one i have on my car.:bellyroll:

how if i have my local muffler shop make me a custom front pipe with a silencer on it, would that help?
I'm just a fan of how single exit muffler looks, thats why i really wanna keep this setup!

I have the V2 which is the same, but a different rear muffler. It doesnt drone at all with a catless header. Its loud, but no drone. If you dont like it and youre stock, its not going to get better with a different front pipe.

Unless you go with Fujitsubo maybe.
http://i.imgur.com/S84ivP5.jpg

I also like the single exit look! Honestly it won't really help. The vibration really is coming from the straight through canister design, which is part of the design of the muffler.



You could try having them weld a second catalytic converter in :iono:
There is a straight section near the back they could probably weld in an additional resonator, but I'm not sure it'd help. Turn the music up!

Thank you guys for the advices!!!

I'll bring it to the muffler shop and see what they can do, if it still drones like crazy, then ill probably go with a different setup.

You don't need another Cat, you need another muffler. Some resonators will do the trick too. Might be trial and error unless you can find an exhaust shop that knows their shit.

No way the HKS single v2 with Catless headers doesn’t drone??? Are you NA or Turbo or Supercharged? Also if it’s loud but doesn’t drone are you referring to the volume outside of the vehicle? I’m looking for a setup that can possibly have less drone than my current one (Invidia N2 Catback + Tomei UEL headers). Sounds great on the outside but has decently bad drone on freeway speeds and even just riding around rowing through gears sometimes. Even before I put headers it was decently drony when you compared it to the actual volume it emits on the outside so you can imagine the headers just exaggerated it. Any sound clips from inside?

Well, you ordered the racing version of that exhaust... did you not think it might be loud? The street version is likely what you wanted, which looks like this (different rear muffler). I have the street version seen below on my car. While it is on the louder side of things, it doesn't drone much. Stock FP + Tomei UEL catless header.
https://i.imgur.com/lzmRqzC.png

Maybe there is a difference of definition on "DRONE". Maybe. Being loud doesnt mean it drones. Its when the exhaust resonance vibrates inside the car. My muffler delete droned right at 2700rpm. This HKS Hi-Power V2 "w/ silencer" doesnt do that even with a Gruppe-S catless header and matching overpipe. That chamber hanging off the center resonator is what helps.

What about without the silencer? And no video clips within the cabin?

There is no slip-in silencer, thats just what HKS call the fatter rear section muffler. The V1 is the chrome fart can that hangs below the bumper. Ill try to get a video.

The chrome fart can ��
Okay if you need you can send the videos to my insta YSoAggressive, very interested in this if it doesn’t really have much drone because I’ve been looking at different single exits that can replace my current Invidia N2 + Tomei UEL setup otherwise if there is none I’ll just get the CSG Touring 86

CSG Touring sounds like an excellent choice provided you have the budget. The HKS Ive seen as low as $525. That was a little while ago. Just Google "FRS BRZ HKS HI-POWER V2".

So what I have done is modified my stock FP and added a much larger resonator. Also look at this thread. These hangers really help with drone.

Resonator I used and had a shop weld into my FP: Vibrant 1140 2.25" Ultra Quiet Resonator

Thread for JP Spec STI hangers: https://www.ft86club.com/forums/showthread.php?t=143514

I would try these 2 things before you swap FPs and exhaust

I know the CSG Touring 86 is the answer to pretty much no drone setup but I was wondering if the HKS HI Power Single V2 had low drone as well or at least less than what an Invidia N2 + UEL headers would give you because I do like the single exit look. I’d much rather have it but if this isn’t an ideal option and the drone is pretty much the same if not even worse than what I already have for my setup I’ll definitely just go with the CSG Touring 86. That’s what I’m trying to get at and trying to figure out here.

I have ordered those hangers from Nengen so just waiting for them to come in but right now just trying to figure out if there is more or less drone with the Hi Power Single V2 setup than my current setup because if it has less I would like to switch to it over the CSG Touring 86. I don’t necessarily want the quietest setup just one where the drone isn’t so bad that I can’t talk to my passenger during cruising speeds like my Invidia N2 + Tomei UEL headers combo.

I am so confused... What's your current setup From Headers all the way back.

My current setup is the Invidia N2 Catback with Tomei UEL headers, stock fp, stock op

compared to the N1/2 the HKS might have a bit less but most single exits are very loud and drone. Drone does not = loud. As i listed in your other thread, Lots of options with dual exit exhausts if your looking to cut out drone. Honestly what I would do is get the resonator I suggested and get it welded in. See if it cuts down on the drone. From there I would pick your catback.

I also have the HKS HI-Power...I ordered a silencer for 55$. Its suppose to take the noise level down to the same level as V2. I'd try that route first

Yeah I know there are other options but if we are talking least amount of drone for a single exit exhaust what would be the best single exit for that? Would it be the HKS Hi Power Single V2, Tanabe, CLEiB? That’s what I’m wondering because I love that single exit look now if you personally think that a single exit no matter which one will most likely have more drone than my setup I’ll just consider grabbing one of those dual exits.

I am running this. Only available in an axle back. No drone in my setup and surprisingly quiet for what it is. Drone has more to do with the system as a whole, not just the axle back/cat back. I am running a 3" catted front pipe with a Helmholtz resonator and catless header.

https://shop.namelessperformance.com...et-track-pipe/

If you want quiet single-exit, the Blitz Nur-Spec R is worth considering and I'm willing to bet is THE quietest single-exit, so should be a great candidate to pair with a catless header. Part # MT3290. I used to have the CLEiB, it was pretty loud even with stock header.

I used to own the Blitz too, but had stock header, so can't give you an impression with a catless header. But here's an impression from another member:

Was this with or without the silencer because from the website it says it’s got a detachable silencer which would mean I’d have to put one in I assume?

There was no detachable silencer for the FR-S/86/BRZ application, so it's tame on its own.

Wow okay sounds like a great option I never thought about them! When you used to have the exhaust, I know you said you didn’t have headers with it, but did it drone in any way or at cruising speeds? That’s my main concern at least with my exhaust my ears about start bleeding on the freeway smh

No drone whatsoever; volume was only a tad louder than stock.

Even another member who had a catless header with the Nur-Spec R reported no drone:

"My system consists of an ACE 4-2-1 Type-A 350 equal length header, Motiv catted front pipe, and the Blitz Nür Spec R stainless steel exhaust, and there’s no drone and conversation is easily held at any RPM..."

Probably worth it to point out that it seems the really high quality thick wall ceramic coated EL headers like JDL and ACE seem to quiet things down a lot compared to most cheaper UEL headers.

This. My JDL header with stock everything else was barely different sounding that stock, except for the UEL tone of course.

I agree with this as well.

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Wishing I didn’t get the Tomei UEL headers now although they aren’t cheap they are just loud :(

Power wise and build quality they are solid. Just thin SS so they are loud. If you want the UEL rumble look at JDL UEL or FTspeed catted and coated headers

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Just did some minor sound testing with my Invidia N2 Catback + Tomei UEL headers and inside the cabin I got anywhere from 78db to 88db (cruising and accelerating speeds). Then I went to an open area where sound couldn’t echo very much, had a buddy stand about 10 feet from the left exhaust and revved to 4k reaching about 98 - 101db. Revved 3k about 92 - 95db. The Tanabe I believe is like around that range for decibels and BTR Justin had been recorded at around upwards to 102db while racing it.