Would you state the brand of your exhaust and post the decibel level check at IDLE, HARD ACCELERATION and CRUISE SPEED[ 75mph ]. Also post the MAX decibel level recorded in your car. You may want to elaborate on the decibel level changes with some other components but try to be right on the money and be as precise as possible. It will vary on some different surfaces but maybe take 3 measurements, add them up, divide by three to get an average in each category. This will give us a point of view which exhaust is the most quiet and the loudest. If you don't have access to a decibel meter download an application for yours or your friends Iphone.

 

Greg. Enough. Please! Don't tell us to drill some thing again

 

We will be able to do that once we get our 2nd batch in.

 

This is a completely useless test, as there are too many confounding variables.

Road conditions
Tires
Rims
Suspension
Wear/tear on car in general.
Windows up/down and/or sunroof.

 

Yeah just drill holes in it!

 

If you stay within the guidelines in my thread and do the test 3 times it will give you some sort of average. We assume the hard acceleration and a cruise test would be done on the interstate at 75 miles per hour. So the remaining idle test would not make a drastic difference. As for the tires and rims and any other equipment you may elaborate on it in the extra remarks to the test. Naturally lets keep the sunroof and the windows up since it is the sound test of the interior. I think this will help the exhaust manufacturers to fine tune their products after seeing those results.

 

haha, no drilling this time. Now a pure science!!!

 

See guys, this is a mark of a professional. He is not afraid of the test cause he is confident about the product. It would be just as interesting for them as suppliers to hear the results from the other members with the same exhaust. It helps the manufacturer to further define the product for commercial purposes.

 

Greg. Why do care about this? You just made holes in your exhaust and if there is an exhaust to your liking. Will you spend the money to buy it. You just went against your own dam word of not spending money. Not to mention you trashed the stock exhaust

 

Let me just pull my trusty decible meter out of my pocket....


Damn it, it is broken. Someone drilled a hole in it.

 

If I have a drilled hole in the floor board will that count?

 

 

I got a decibel meter and you are missing no less than three varible settings. Are you looking for the A-scale or C-scale readings? Do you know the difference in the scales? Fast response or Slow responce? High or Low range dB readings?

Using the iPhone to check dB reading is like using my c**k as a ruler.

 

My C**K is accurate up to 12 inches!

 

The road surface alone would have a variance of at least 30 dB with one car.

Tires "hum", and are tuned for noise. Lou can tell you. Invo vs NT05 anyone? MASSIVE difference.

As for idle, even an open header wouldn't be super loud at idle. Louder than your typical exhaust? yes. Excessive on a production street car? no.


The only way to get consistent results is to eliminate the variables. E.g. All tested on the same car, similar weather, same tires (and level of wear on tires)