Quietest Boosted Exhaust?

2011 Nismo#91 · 04-25-2017, 10:19 AM

For quiet and cheap put back the stock or nismo axle back muffler.

MoulaZ · 04-25-2017, 03:24 PM

Quote:

Originally Posted by Chuck33079

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.

Arguing opinions of sound levels online is always going to seem a little silly... but I am firmly in belief you just cannot have 3" system and an SC without a radical redesign if you want tolerable noise levels. Turbos affect that noise level a lot, not just somewhat.

Had a guy come by last night with Berk HFCs and Powerhouse Amuse1 CBE and he flipped out when I turned mine on and heard.... he thought his was pretty loud.

Quote:

Originally Posted by 2011 Nismo#91

For quiet and cheap put back the stock or nismo axle back muffler.

Are you kidding? Why not just give up and go back to NA then...

That is NOT a solution. -_-

2011 Nismo#91 · 04-26-2017, 08:25 AM

Quote:

Originally Posted by MoulaZ

Are you kidding? Why not just give up and go back to NA then...

That is NOT a solution. -_-

Sorry for reading the OP's question.

MoulaZ · 04-26-2017, 08:54 AM

Quote:

Originally Posted by 2011 Nismo#91

Sorry for reading the OP's question.

Yeah, because basically choking the f*ck out of his boosted car is a legtimate solution...?

TBatt · 04-26-2017, 10:30 AM

My experience.....

When my car was NA I installed the Fast Intentions CBE and the sound was great. Then I installed a Stillen SC kit and the sound got much louder. Next was a tune by Seb and again the sound changed, this time to a much lower and throaty sound.

Every change you do will affect the sound and level. I absolutely love the sound of my Z now!

TopgunZ · 04-26-2017, 11:02 AM

Quote:

Originally Posted by TBatt

My experience.....

When my car was NA I installed the Fast Intentions CBE and the sound was great. Then I installed a Stillen SC kit and the sound got much louder. Next was a tune by Seb and again the sound changed, this time to a much lower and throaty sound.

Every change you do will affect the sound and level. I absolutely love the sound of my Z now!

Stock cats or test pipes?

2011 Nismo#91 · 04-26-2017, 11:08 AM

Quote:

Originally Posted by MoulaZ

Yeah, because basically choking the f*ck out of his boosted car is a legtimate solution...?

And your solution of no solution is better. And just to educate you the muffler itself provides only a minor amount of restriction. I don't even think any list any gains from the axle back for the Z. It's the cats and small 2.25" dia piping from the exhaust headers down that significantly restrict flow. I doubt the loss would be greater than 1% which is not noticeable and you get a "quiet" car which is what was being asked.

Kzonts · 04-26-2017, 12:30 PM

Quote:

Originally Posted by TBatt

My experience.....

When my car was NA I installed the Fast Intentions CBE and the sound was great. Then I installed a Stillen SC kit and the sound got much louder. Next was a tune by Seb and again the sound changed, this time to a much lower and throaty sound.

Every change you do will affect the sound and level. I absolutely love the sound of my Z now!

I would think it sounds awesome too. I'm NA and recently was tuned. I was surprised at the difference in the exhaust sound. And I have stock cats.

Kzonts · 04-26-2017, 12:37 PM

How is the stock GTR exhaust so quiet? Seems you should be able to simulate that setup on a 370Z as well.

Hotrodz · 04-26-2017, 12:46 PM

After reading through the comments again there are not a lot of options that will look pleasing to the eye trying to cut down the noise coming out the exhaust do to the restrictions that start out of the manifold. When you add a supercharger or a twin turbo you are pushing a lot more air through the system and the restrictions will cause an increase in sound and can cause performance issues due scavenging. A 3" down pipe is needed to benefit a 3" exhaust system. This will significantly cut down on the sound. The Motordyne exhaust only becomes 3" where it meets up with the connection to the y pipe so the sound is actually magnified. I have had the pleasure of riding in a Z that had a twin SC and a Motordyne exhaust system on it. Yeah she was loud and sexy as hell. I doubt there going to any other exhaust will change anything significant because of the amount of air moving through the system. Yes, I think maybe a system like Armytrix might help to a degree but that is an expensive option that may be a fail. I would suggest having a baffle or butterfly value put in that can be manually turned on or off.

Sent from my SM-N910P using Tapatalk

Jayhovah · 04-26-2017, 12:48 PM

What about the garageline exhaust? It's looks like a higher flowing version of the OEM exhaust. Unfortunately I don't think a ton of people on here have it... It is very cost effective too!

Hotrodz · 04-26-2017, 01:04 PM

Also, I think it would be a good idea for the OP to give Sebastian a call regarding a solution as a 3" down pipe and exhaust could potentially impact performance negatively because a SC doese need some back pressure to make optimum power so it's a catch 22!

Sent from my SM-N910P using Tapatalk

TBatt · 04-26-2017, 01:04 PM

Quote:

Originally Posted by TopgunZ

Stock cats or test pipes?

Stock cats for now.

TopgunZ · 04-26-2017, 03:54 PM

Quote:

Originally Posted by TBatt

Stock cats for now.

That is why it sounds so good. The best sound I ever heard coming from a Z was when I had the stock cats with FI exhaust. Take those cats off (because boost) and its a total game changer. They act as 2 giant mufflers.

Your cats will eventually blow out on you.

Quote:

Originally Posted by Kzonts

How is the stock GTR exhaust so quiet? Seems you should be able to simulate that setup on a 370Z as well.

Because it has cats.

Cats that were designed for forced induction.

Jayhovah · 04-26-2017, 03:57 PM

Quote:

Originally Posted by TopgunZ

Because it has cats.

Cats that were designed for forced induction.

And turbos. They make an enormous difference.

04-25-2017, 10:19 AM	#31 (permalink)
2011 Nismo#91 A True Z Fanatic Join Date: Mar 2011 Location: NJ Posts: 2,402 Drives: slowly Rep Power: 40569	For quiet and cheap put back the stock or nismo axle back muffler. TechnicZ likes this. __________________ GTR TT 493Whp/431lbft, Ecutek, Southbend 6puck,Quaife, RPM RollBar 4Point, R888R, JRZ RSPro F(10R/10C) R(10R/6C) 1000f500r inlbs+150inlbs Tender, SPL everywhere.Full Specs

04-26-2017, 10:30 AM	#35 (permalink)
TBatt Track Member Join Date: Apr 2013 Location: Huntsville, AL Posts: 832 Drives: 2019 GT-R Rep Power: 20168	My experience..... When my car was NA I installed the Fast Intentions CBE and the sound was great. Then I installed a Stillen SC kit and the sound got much louder. Next was a tune by Seb and again the sound changed, this time to a much lower and throaty sound. Every change you do will affect the sound and level. I absolutely love the sound of my Z now! Kzonts likes this. __________________ RJM pedal, Hotchkis Sway Bars, FI TDX, FOG Light, Z1 Slotted Drilled rotors, Stillen SC, Quaife ATB, Z1 Oil cooler, AEM Gauge Set, Galeforce gauge mount, Avant Garde M590 Hypersilver w/RE-11, TopgunZ A2A kit., ECUtek tuned by Seb: ROLL TIDE!

04-26-2017, 12:37 PM	#39 (permalink)
Kzonts Track Member Join Date: Mar 2015 Location: Greenville, SC Age: 61 Posts: 872 Drives: 2019 Roadster Rep Power: 200741	How is the stock GTR exhaust so quiet? Seems you should be able to simulate that setup on a 370Z as well. __________________ 2019 Magnetic Black Roadster FI Exhaust \| EVO-R Rear Diffuser \| Artwork Bodyshop Front Splitter \| Tuned By Specialty Z

04-26-2017, 12:46 PM	#40 (permalink)
Hotrodz A True Z Fanatic Join Date: Aug 2012 Location: NW, AZ Posts: 9,330 Drives: 10 Nissan 370z Nismo Rep Power: 2684385	After reading through the comments again there are not a lot of options that will look pleasing to the eye trying to cut down the noise coming out the exhaust do to the restrictions that start out of the manifold. When you add a supercharger or a twin turbo you are pushing a lot more air through the system and the restrictions will cause an increase in sound and can cause performance issues due scavenging. A 3" down pipe is needed to benefit a 3" exhaust system. This will significantly cut down on the sound. The Motordyne exhaust only becomes 3" where it meets up with the connection to the y pipe so the sound is actually magnified. I have had the pleasure of riding in a Z that had a twin SC and a Motordyne exhaust system on it. Yeah she was loud and sexy as hell. I doubt there going to any other exhaust will change anything significant because of the amount of air moving through the system. Yes, I think maybe a system like Armytrix might help to a degree but that is an expensive option that may be a fail. I would suggest having a baffle or butterfly value put in that can be manually turned on or off. Sent from my SM-N910P using Tapatalk __________________ *Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:\|Fast Intentions 3" TT-TDX*\|SpecialtyZ/Fast Intentions 72 Row Oil Cooler\|SZ 6 Puck Clutch & Flywheel\|3GsCustoms\|Z1\|Wavetrac\|Hotchkis\|Whiteline \|Blitz\|Fortune Auto 500\|Fujimura\|SPL\|H&R\|TK\|TWM\|RPM Rollbar\|Sparco\|Next Level Performance\|TrackSpec\|AeroFlow Dynamics\|Pioneer\|

04-26-2017, 01:04 PM	#42 (permalink)
Hotrodz A True Z Fanatic Join Date: Aug 2012 Location: NW, AZ Posts: 9,330 Drives: 10 Nissan 370z Nismo Rep Power: 2684385	Also, I think it would be a good idea for the OP to give Sebastian a call regarding a solution as a 3" down pipe and exhaust could potentially impact performance negatively because a SC doese need some back pressure to make optimum power so it's a catch 22! Sent from my SM-N910P using Tapatalk ChaseZ likes this. __________________ *Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:\|Fast Intentions 3" TT-TDX*\|SpecialtyZ/Fast Intentions 72 Row Oil Cooler\|SZ 6 Puck Clutch & Flywheel\|3GsCustoms\|Z1\|Wavetrac\|Hotchkis\|Whiteline \|Blitz\|Fortune Auto 500\|Fujimura\|SPL\|H&R\|TK\|TWM\|RPM Rollbar\|Sparco\|Next Level Performance\|TrackSpec\|AeroFlow Dynamics\|Pioneer\|

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