The Ultimate Exhaust Sound Level Thread

[FrangaR33]

All numbers are the stock car only with the bolt on Catback System

All numbers are manufacturers claims.

Naturally feel free to add to thread if you any addition info

GTR Exhausts RB26

EPA Test RPM: 5100rpm

Stock Exhaust at EPA Rpm

R32 GTR - 94dB @ 5100rpm

R33 GTR - 92dB @ 5100rpm

R34 GTR - 93dB @ 5100rpm

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Trust GReddy PE Ti-R Power Extreme Titanium Muffler Nissan Skyline

R32 GTR - 93dB @ 5100rpm

R33 GTR - 95dB @ 5100rpm

R34 GTR - 93dB @ 5100rpm

BLITZ Nur Spec RX Muffler Exhaust System

R33 GTR - 93dB @ 5100rpm

R34 GTR - 93dB @ 5100rpm

BLITZ Nur Touring Muffler Exhaust System

R33 GTR - 92dB @ 5100rpm

R34 GTR - 93dB @ 5100rpm

HKS Silent Hi-Power Muffler

R33 GTR - 98dB @ 5100rpm

R34 GTR - 93dB @ 5100rpm

Trust GReddy Power Extreme II Muffler

R33 GTR - 99dB @ 5100rpm

HKS Hi-Power 409 Muffler

R33 GTR - 98dB @ 5100rpm

GTS-T Exhausts RB25

EPA Test RPM: 4800rpm

Stock Exhausts

R33 GTS-T - 87dB @ 5100rpm

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Trust GReddy Power Extreme II Muffler

R33 GTS-T - 99dB @ 5100rpm

HKS Hi-Power 409 Muffler Nissan

R33 GTS-T - 98dB @ 5100rpm

[FrangaR33]

Soure: Blitz Website

Stock Exhausts - Not sure what rpm these are recorded at

Toyota

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Toyota Aristo - 78db

Toyota MR2 - 94db

Toyota Supra 1JZ-GTE,7M-GTE - 85db

Toyota Supra 2JZ-GE - 82db

Toyota Supra 2JZ-GTE - 87db

Toyota Soarer 1G-GTE,7M-GTE - 83db

Toyota Soarer 1JZ-GTE (May 91 - August 96) - 83db

Toyota Soarer 1JZ-GTE (August 96 - April 01) - 84db

Toyota Celica 3S-GTE (September 89 - Febuary 94) - 88db

Toyota Celica 3S-GTE (Febuary 94 - September 99) - 83db

Toyota Chaser 1JZ-GTE (October 92 - September 96) - 84db

Toyota Chaser 1JZ-GTE (September 96 - August 98) - 86db

[Piggaz]

When getting tested for noise is it underload or just in neutral? The Kakimoto N1 "is fairly" quiet... until the gates open. Then its about 6 billion db!

[TiTAN]

in neutral no load.

[R31Nismoid]

So pretty much every exhaust is illegal...

That comes as a massive surprise

[GTScotT]

LOL stock GTR is illegal, killer!

[TiTAN]

does anyone know what muffler configurations these exhausts have?

i need to get a 3.5" exhaust with large mufflers in it and its cheaper to get a jap cat back and change the rear canon to a large muffler than get a custom made exhaust if there is already a decent sized mid muffler (not a hotdog)

[alr33x]

good thread will read again.

[FrangaR33]

I was looking for a EPA friendly (less than 90db exhaust for the R33 GTR) but it appears they dont exist....even stock. So it looks like the custom route is the only way. Has anyone ever found a way to pass EPA with a custom made exhaust and if so what sort of set up.

Soure: Blitz Website

Stock Exhausts - Not sure what rpm these are recorded at

Nissan

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Nissan 180sx CA18DET - 88db

Nissan 180sx SR20DET - 85db

Nissan Silvia S13 CA18DET - 87db

Nissan Silvia S13 SR20DET - 85db

Nissan Silvia S14 SR20DET - 83db

Nissan Silvia S15 SR20DET - 88db

Nissan Stagea RB25DET (September 96 – August 98) – 80db

Nissan Stagea RB25DET (September 96 – October 01) – 82db

Edited May 13, 2010 by FrangaR33

[Count Grantleyish]

May worth giving Racepace Motorsports a ring and find out how quiet their custom exhaust are.

But they're not cheap though.

[TiTAN]

i had a talk with them already they would need the car and they are well out of my budget price wise with travel etc

[R31Nismoid]

May worth giving Racepace Motorsports a ring and find out how quiet their custom exhaust are.

But they're not cheap though.

90-91dB as tested on my car.

Mine is first gen, there has been another created since.

[Count Grantleyish]

Whoa, that is quiet as!

What pipe size are these 3" or 3.5"?

[TiTAN]

i need something 3.5" from memory ash has 3.5"

[R31Nismoid]

3.5"

[FrangaR33]

90-91dB as tested on my car.

Mine is first gen, there has been another created since.

So basically the only conclusion one can draw from this is, Nissan, Japanese Performance part manufacturers = FAIL. Racepace = Awesome.

[TiTAN]

Racepace said they make the exhausts mainly so race cars get good high flowing exhausts that dont get them kicked off tracks for breaking DB limits, they dont guarantee that it will pass a noise test.

The jap companys (and most aftermarket exhaust companys) are catering to a market that 90% of people who buy them want more noise not less/the same as factory.

Japan also has a 92db limit so factory they can be louder than here.

[Dan_J]

i thought an epa test is only measured to 3000rpm?

good info none the less

[R31Nismoid]

^ Depends on the motor.

So basically the only conclusion one can draw from this is, Nissan, Japanese Performance part manufacturers = FAIL. Racepace = Awesome.

You can draw whatever you want.

The actual conclusion is that a very well designed system can be 3.5" and be very quiet. That is all the aim was.

They were not built to pass EPA. Main creation was for quiet track cars, and good flow for 400rwkw or so as stated.

Customers wanted performance of the circuit, with a exhaust level that would not see them defected contstantly.

Most jap exhausts are just too loud as there is a bit different betwee 94-95 dB and 90-91dB.

A Racepace system will easily cost you double what off-shelf Jap one will, I tell you that straight up.

I'm confident other places could build similar exhausts, but again they won't be cheap either as the mufflers are $$$

I've gone from being heard a block away (108dB), to people not even noticing my car pull up anymore

[FrangaR33]

i thought an epa test is only measured to 3000rpm?

good info none the less

According to the ESMP (Engine Speed At Maximum Power) EPA Manual It specifies the EPA test for a:

RB26DETT - 5100rpm

RB25DET - 4800rpm

Yeah I know about the 92db limit in Japan, its just a pity we dont have any manufacturers (that I know of) making EPA compliant after market exhausts here, especially considering the fact a stock exhaust wont pass. They would make an absolute killing.

Edited May 13, 2010 by FrangaR33