m4 full exhaust 105 @ 8k rpm
30 ft directly behind with electronic db meter
30 ft directly behind with electronic db meter
The long list taken above was done fairly scientifically by SSB and is in the link providedWhat equipment and testing procedure are you using to measure decibels?
Yes, comparing dBs levels like this isn't scientific but gives those who are interested a decent comparison as to how loud it is vs the typical "louder than stock" comment.This is so prone to error and variation when comparing online noise levels it isn't even worth asking. The test procedure, location the test was done in, equipment used and operator training/proficiency very so widely it's impossible to good comparative numbers off the internet. Even for professionals taking measurements, there are more than a few "accepted" test procedures.
Stock exhaust = most likely quietest
Aftermarket CARB/EPA stickered exhaust = louder than stock (slightly)
Aftermarket non-CARB/EPA stickered "street" exhaust = louder still
Aftermarket "race" or "off highway only" exhaust = loudest
You must have ignored the part where they explained that was why they decided not to post actual decibel levels but instead the difference between the recorded stock decibel and aftermarket decibel level. What difference does it make now? Real world, the stock should be around 80. Let's say in that Dyno room, it comes to 90 or any arbitrary number you want. Now you change the exhausts and record the decibel levels and note the difference. Not sure why it is so hard to grasp. Everything in the Dyno room is basically the same and the only big change is the exhaust. All the different exhaust systems were tested in the same Dyno room under similar conditions. It at least gives us a very accurate picture of which slip on is louder and which ones are quieter; anyone who has owned a Two Brothers or an M4 will agree with te results that those two are two of the loudest around. But carry onAs I said, that SSB info is utterly worthless. It was taken inside a dyno room with all the fans and dyno running. It has no relation to how loud a system will be in the real world. Nor can it be used to compare sound level numbers obtained anywhere else.
No Decibels were given but instead reference numbers to how much louder they were from stock for a reason. And also, the same testing equipment and procedure and environment were used for the stock can and the aftermarket ones. So even if it was innacurate, they all underwent the same inaccuracy and with the law of relativity the information is definitely useful when comparing how much louder from the stock can these exhausts are. So shadappAs I said, that SSB info is utterly worthless. It was taken inside a dyno room with all the fans and dyno running. It has no relation to how loud a system will be in the real world. Nor can it be used to compare sound level numbers obtained anywhere else.