[TheSpilDog]

good morning.

I have a 335is and recently installed AR catted downpipes. At the same time, I sent the ECU to Vishnu for the fuel map in preparation of the RB turbo installation (so my car is running a little rich now).

I find that the exhaust tone in my car at low RPM's taking off a light or a stop sign is off... it might be normal but for me i'd like to be a little more contained.

My exhaust is otherwise stock.

My questions are:

1. Can this be because the car is running too rich?
2. if no, what can I do to reduce this type of sound? I don't mind a loud exhaust, I just want to remove that

below is a link to a video. hard to tell but you hear it a the fourth second of the video and it lasts for a second.

https://dl.dropboxusercontent.com/u/...8/IMG_2268.MOV

let me know your thoughts.

thanks

[n54gte]

335is has a different exhaust than a regular 335i so thats probably why

[TheSpilDog]

Any other opinions? is there an aftermarket exhaust or custom modifications that might deal with this?

[TheSpilDog]

do you think if I add resonators it will help?