Circuit werks exhaust. Resonance

[RedBeauty]

There is no leaks from the exhaust.
I've might missunderstood what drone is. I belived that was a more high frequent sound.

Unles there is a easy solution to fix this i wil put the Stock back on as i use the car evry day. too bad since the sound over 3k was Nice

[boxxster]

Many people have had the same issue with that exhaust and reported that it went away with the addition of secondary cat bypass pipes. However, if you have an earlier car (2.5L) that only has two cats this will give you a check engine light.

I have the bypass pipes right now and ordered that same exhaust based on the good reviews I have read about the combination.

[thstone]

Originally Posted by Carl.O

There is no leaks from the exhaust.
I've might missunderstood what drone is. I belived that was a more high frequent sound.

Drone is a when the exhaust exhibits a particularly louder sound at an annoying frequency in a fairly narrow rpm range.

The Top Speed/Circuit Werks/etc cat back exhaust is pretty well known to exhibit this behavior around 3000 rpm and it is typically heard while cruising on the freeway at near constant speed/rpm. The constant din of extra loudness/unique frequency can be fairly annoying.

Let us know if this is what you're experiencing or if its something different.

[Luv2Box]

Originally Posted by Carl.O

There is no leaks from the exhaust.
I've might missunderstood what drone is. I belived that was a more high frequent sound.

Unles there is a easy solution to fix this i wil put the Stock back on as i use the car evry day. too bad since the sound over 3k was Nice

"Drone" is caused by exhaust valve harmonics. The thinner the metal on the headers the louder the drone. It's why your stock headers are so bulky and thick they help mask the drone and it happens the loudest in exactly the rpm range you are stating.

[Porsche9]

A number of other forum members have noted that installing the secondary cat delete eliminates the drone issue. Hopefully someone that has done this can chime in a validate.