2.5" custom exhaust. magnaflow 4" x 18" muffler for a resonator & some ricey canister I bought at Hot Import Daze for $100. (Max Speed is the brand )

Anyways, under hard acceleration, the car registered a MAX of 100 decibles. Just free revving while parked, it doesnt even reach 90 decibles. This is all done from inside the car, BTW. Its one loud ***** ****** exhaust! Thank goodness for the butt-plug silencer...

Well, I have a sound meter so if anyone wants to do a "great exhaust noise level test", I can arrange that with the help of many cars with a wide variety of exhausts, a place where we can rev the crap out of our cars without getting thrown in jail, and me with my meter. Or if anyone just wants to know how loud their car is, let me know and we'll try to arrange something.

 

you should measure how loud it is with no exhaust.

 

well, if someone wants to unbolt their exhaust, i'll gladly measure it.

 

That is a great idea actually and something that would be extremely useful to everybody here (everybody is asking about the sound/noise of exhausts).

I would measure them all from a standard distance from outside the car. The absolute decibel ratings would be nice, but comparable decible ratings would be hugely valuabe... for example: "The Spoon N1 is twice as loud as the Comptech but the Type One N1 is the loudest of them all"

How can we set something like this up?

 

I can get exact numbers. Its just easier when im not driving and measuring at the same time.
I can measure it according to the laws speculations... and i am thinkin idle, max, and from inside the car also. With the numbers, we can say, "stock is this loud, but Spoon N1 is this much louder."
Like i said, i need to get a bunch of cars with lots of different exhausts. (even stock) I dont even need it all at once, but it'd be faster that way. My car meet is still a while away, but if people wanna meet for lunch or something, we can get this started.

 

remember intakes will make differences in noise levels. i think an ITR sound test would be awesome btw

 

yah, i'll be sure to get the list of engine mods too... with my car, the supercharger makes it a bit louder... but it will help to give people a good idea of the exhaust regardless. im just too lazy right now to get sponsors and everything, and with school approaching soon... i dont feel like doing too much.

 

Bring your sound meter to the next SOCAL BBQ I want to know what my Apexi N1 puts out

 

I also have a db meter that I could use, so if some one on the east coast has an exhaust that the west does'nt I could give specs.............

 

well you are 1 so cal resident who is willing... its not gonna be much of a "great exhaust dB test" if theres only one.

 

uh oh, the next big dick size contest..."my exhaust is xxxdbls louder than yours, ha-ha!"

 

i'll be able to get a decibal reader once school starts. then i'll be able to measure how loud my T1R exhaust is

 

sweet huy!

 

nah i'd take quiet over loud anyday... as long as performance isnt hurt

 

Well, you could use my stock exhaust. At least until I have something better.

 

does anyone know what the law requires in cali? i rememebr they just set that Db level limit right? or am i wrong.

 

It's like 76 or 86 (one of them) in BC........... I wouldn't be surpised if its the same in Cali......

 

that seems very low, JASMA approved exhausts all have to be below 98db.

 

I have an AEM in my GSR (Energy Suspension motor mounts and some delrin bushings also add to transmitted noise), bouncing of the rev limiter in 1st I hit 99db. If I remember right I sit at 76db or 77db cruinsing at 80 on the hwy.

 

But where is the measured?? 98db from inside the car? From 20 feet to the side of the car? 50 feet from behind the car?

 

California Law requires it to be 95 dB or less on cars. This is to be measure 5 ft behind the car, testing instrument pointed at the exhaust, standing sideways so that it does not cause an echo of your body, and making sure there isnt a building nearby for the same reason. The car is then revved to 5000 rpm.

Now ask any cop and they probably wont have a clue, but this is the meathod described in the CA Vehicle Code.

And yes Chris, I will use your car for a stock measurement... but you need to get yo *** back to cali first!

 

We did this at an NC dyno day back last fall. Don't have all the numbers in front of me, but Jason F's old setup put out about 116 dB, at exhaust level 20ft behind the car.

Inside my Type R, full throttle in third gear registered 88 dB.

Highest we saw was a hatchcrap with test pipe - 118.x dB!

 

what did jason have pat?

 

Tanabe RM 0wnz!

Just wait until I start running open header next year!!!

 

open header is sweet. I have grown to like it.