Berk technology exahust load?

[Boosted_N54]

How load is berk technology full race exhaust system with catless DP . Reason I'm asking is because I have an event in lime rock track and can't be louder then 86db whatever that means

[Ghent]

86db is pretty quiet really...

I stock exhaust on a 135i is listed as 88.5...

[Boosted_N54]

Originally Posted by Ghent

86db is pretty quiet really...

I stock exhaust on a 135i is listed as 88.5...

lmao wow

[Freon]

You need to contact the track for clarification on how they measure sound level. You can influence the measurement by 10-15 db easily. I think typical controlled testing for an exhaust is something like 6 feet away, 6 feet from the ground directly behind the car. But the track might measure on the side of the track as you pass, maybe 10-15 feet away, with the microphone pointed perpendicular to the direction of travel. There are even different weightings for decibels that are more or less sensitive to certain frequencies. (A, B, or C weighting, etc.) Without knowing the conditions of the test, throwing numbers around and gawking at them is pointless at this point, and you're going to get worked up over your ignorance and not the facts.

Nevertheless, sound is often a concern for tracks and really racy exhausts often will fail. There's no way the stock exhaust would fail. I'd bet you they are measuring track side, but you should seek information from the track itself, not ask on an internet forum.

Our local SCCA regional autocross does sound testing. I think their limit is 92dbA or so, and they measure with a microphone pointed to the back of the car where it will travel in a straight line on the course. I don't know the exact details, but usually there are not many issues for people unless they have pretty obtuse exhaust setups (straight dumps out of turbo, straight pipes with no mufflers or resonators, etc). Sounds like your track is more strict, but I bet their testing is similar.