Does this exists?
 

I'm looking for a quiet catback, or better an axle back, in 60mm with just resonators and no mufflers.
Do you know if this exists?

anything without a muffler is going to make more noise than stock. you might be better off changing your exhaust tips if you want the look without the noise.

This? Namelss Single exit without muffler. FYI it's louder than stock. Even muffler ver was louder.
https://www.carmodsaustralia.com.au/...ll/RSPD016.jpg

I would suggest you consider this axle back with 5" mufflers (just call the mufflers resonators ;)).

https://shop.namelessperformance.com...r-s-2013-2016/


humfrz

I am with humfrz, mufflers muffle sound. Resonators resonate sound. Not sure you can get quiet without the muffle.

Supersprint just use resonators, and they are very quiet. But the one for 86 is 63 mm.

From the outside, they look like little mufflers to me .. :iono:


humfrz

Can I ask why 60mm is required and 63mm is unsuitable?!

Nope, Supersprint just uses resonators in its exhausts, even the version with 1 resonator, it has Y drilled pipe inside. 63 mm moves torque toward high revs.

So to answer your question, No. An axleback or catback doesnt exist that's going to be "quiet" when you exclude the sections that make it quiet. And 3mm increase diameter in piping isnt going to make a dramatic leap and move all the TQs way high in the rev range, let's be real.

Sent from my SM-G950U using Tapatalk

You will be lucky to have any horsepower or torque difference with a catback so 3mm either way isn't going to shift your torque curve.

You said the supersprint has the resonators and the volume you want and basically the size you want. I'd just go with that. Don't get hung up on paper specs.

I agree somewhat with your concern for pipe diameter.
I would go with keeping the piping the same as what is coming off your header/overpipe.


For example I had Gruppe-S UEL with overpipe that ended in 60mm.
Therefore I went with An Invidia FP an HKS catback 60mm. This keeps VELOCITY consistent all the way through.


Now I have just installed ACE 350 Headers/overpipe that end in 63mm(2.5").
So I just now ordered a Hooker HF cat/Helmholtz J-pipe Front pipe, And Agency catback exhaust all 63mm (2.5")


Will there be a huge change in HP/TQ I doubt it. But I like knowing the flow will be consistent all the way through without either bottlenecks (too small piping) or too slow velocity (too large piping).

I'm also with @humfrz I can't find a version of their exhaust WITHOUT mufflers... https://www.supersprint.com/ww-en/to...-hp-12-16.aspx

Maybe the terminology or translation is different? Are you thinking of the Catalytic Converter?

@gpvecchi what do you consider a "resonator", what do you consider a "muffler"?


humfrz

Is there a reason you don't want mufflers?

Asking for an exhaust without mufflers that's also quiet is like having a baby and expecting it not to cry.

A muffler is a silencer made with different chambers, and gases slow down in them, while a resonator is a straight drilled pipe with some glass absorbent around it. I previously had a NA 2000 cc with 180 HP, and I swapped 63 mm exhusts with 60 mm, and I noticed the difference (dyno too). Perhaps I'm sensitive. Supersprint factory is 30 km from my house, they don't use mufflers.

Muffler and resonators: https://www.cjponyparts.com/resource...-vs-resonators

They make straight through mufflers too

Mufflers are made to lessen sound, resonators are made to remove certain frequencies of sound.

Different types of mufflers
https://www.streetmusclemag.com/tech...on-strategies/

what resonators vs mufflers do
https://www.americanmuscle.com/musta...ifference.html

But how much of a difference? Did you swap out the entire exhaust, or just the catback/axleback? Nobody doubts piping size makes a difference and that theres a tradeoff between mufflers and resonators. If there was a quiet, muffled, exhaust system that doesnt restrict flow, half of us would have it by now. The other half would still be rocking 3" straight pipes on NA. Your best bet is to live with the noise, earplugs, louder music and go down to circuit sports and get you a resonated axleback today!Sent from my SM-G950U using Tapatalk

it doesn't matter what you say: people will still say that resonators make things more quiet. its like arguing with a flat earther or any conspiracy theorist

op, your axleback doesn't exist. if you want a quiet exhaust, use the stock one. if you want a quiet aftermarket one, I hear invidia q300 is very quiet. both of those have mufflers, as mufflers make things quiet. if you simply want bigger exhaust tips, ask and see if a muffler shop will fab one up for you

Welp, there is your original post.

Here is a quote from the reference you posted:

"For those who are thinking about just running resonators for their setup, keep in mind that it’s virtually the equivalent to straight-piping your exhaust. Resonators will remove some of the raspy, ping-y noise from your exhaust, but the volume will virtually be the same – ear-piercingly loud. If that’s what you’re going for, then great! If not, plan on picking up an appropriate set of mufflers to accompany your resonators".


Your call.


:)


humfrz

Ignoring terminology, is this what you are looking for?

https://www.hks-power.co.jp/en/produ...ffler/db/15580

Really, direct exhaust are not necessary more noisy than cambers ones. As I said, Supersprint is usually quiet as stock, or even more. I used IE Scorpion (UK) exhaust that was louder even if it had chambers...
This is an Aros exhaust (Italian) for BRZ. I’s straight and really quiet.
https://youtu.be/Ky4JPMHxrSo

So, it looks like you found your exhaust yourself - :thumbsup:


humfrz

Nope... 63 mm... :-(

I hope the only exhaust you can find for any car forever only comes in 63mm.

Sent from my SM-G950U using Tapatalk

Supersprint said once that there were NO GAINS with their axleback or even catback. So, what's the point to focus in this area? Only if sound matters ...

And they too have mufflers... They call them silencers... we call them mufflers.. http://www.differencebetween.net/obj...r-and-exhaust/

https://arosmarmitte.it/wp-content/u...BARU-BRZ_3.jpg

I like how we spend two pages to figure out that no one is on the same page when it comes to the words "muffler" and "resonator".

I think what OP is asking about is exhausts without baffled sound suppression inside, i.e. he wants exhausts with straight through sound suppression design (aka resonator "design" not unlike what is on the stock midpipe)

95% of catbacks out there are straight through, the question of sound is going to entirely rest with the size of the resonators. Plenty of them such as Blitz, Fujitsubo, Greddy, etc. are quiet with straight through design.

-alex

Nope, I contacted them, they confirmed it's straight drilled pipe.
"Silenziatore" in italian is a device that silence. Ther's no strict translation for "muffler". We just call them direct exhaust and chamber exhaust.
Yup, that's the point. I'm looking for a straight through exhauts, like the midpipes are made. I'm sure that Milltek and Perrin are not. Fujitsubo is straight, but just Authorize R...

Well, if you think that an NA engine will make statically significantly more power with a 63 mm exhaust as compared to a 60 mm exhaust, I reckon your butt dyno needs calibration and your dyno run needs to be validated.


BTW, what is your take on light weight crank pulleys …??


humfrz - jest ah messen wich ya (sort of) ;)

Sorry, never tried them...

I was trying to make a funny - at light weight crank pulleys increasing power.. :iono:


humfrz

Thanks everyone! Found! Blitz confirmed that their exhaust is direct!

Yeah but its 61mm

Sent from my SM-G950U using Tapatalk

Technically 60.5mm, OP will be more disappointed now.

Are we talking about OD or ID here?

What about the measurement(s) in the bends?

How many bends?

What are the angles of the bends?

Soooo much to consider .. :confused0068:


humfrz

I asked a question, if you're not interested nobody forces you to post. This is a forum for questions and answer, if you want to make irony, this is not the right place.
In Italy we have a term for this people: bimbiminchia. Now, serch for a translation if you are cleaver enough.

I had no problems with your post up to the point where you wanted to educate us on what a resonator is vs what a muffler is. Even the link you posted doesn't distinguish between baffled vs straight-thru mufflers. Mufflers can look 100% like a "resonator" (and vice versa). The factory front pipe has a big resonator that looks like a muffler but is straight through.

If you want to argue about 63mm exhaust flow characteristics vs 60mm, this is not the right place.

In English we have a saying for this: "argue for the sake of arguing". No translation needed.

Checked translation for "cleaver enough", no luck , you win OP.

Sent from my SM-G950U using Tapatalk