Understanding Pop and Bang Toggle Function
Pop and Bang Toggle Styles:
We know it may seem a little complicated on how you would like to have your pops active, so, we'll explain.
For Non-Ms
OEM+ (Timer) (Recommended)
This essentially means, whenever you let off the throttle, the pops will be active for just a few seconds. About 1.5 seconds on average is what we like to do, but you can request a different time length in the "Modifications" box. We find this to be the most pleasant for the all round daily driver as this gives all the most natural sound a just a few pops on deceleration.
Hint: You can always give the gas pedal a slight tap to reset the timer.
•ms43 •ms45.x •msv70•msv80
Active only with A/C OFF. A/C ON = OEM (Most Popular)
This option is the most popular, and is usually looked at like an "eco mode." So when you have the A/C ON, the pops will be off (OEM), but when you turn the A/C OFF, the pops will become always active. These are polar opposites. So once A/C is off, and when you are decelerating, the car will constant be popping, without a time limit. With this option, this only happens when the A/C is OFF. *Requires working A/C System*
If you are opting for the FLAME option, we suggest selecting this option for the best chances of flames.
•ms41 •ms42 •ms43 •ms45.x •msv70 •msv80
Active only with A/C ON. A/C OFF = OEM
Similar to the option above, but opposite. So when you have the A/C OFF, the pops will be off (OEM), but when you turn the A/C ON, the pops will become always active. These are polar opposites. So once A/C is ON, and when you are decelerating, the car will constantly be popping, without a time limit. With this option, this only happens when the A/C is ON. *Requires working A/C System*
•ms41 •ms42 •ms43 •ms45.x •msv70 •msv80
Active only with A/C OFF. A/C ON = OEM+ (Timer)
Similar to the previous options, instead of going form an on and off state, this option will allow a timer vs no timer state.
So when you have the A/C ON, the pops will be on with the "OEM+ Timer" and only pop for a short duration when you let off the throttle, but when you turn the A/C OFF, the pops will become always active.*Requires working A/C System*
If you are opting for the FLAME option, we suggest selecting this option for the best chances of flames.
•ms45.x •msv70 •msv80
Active only with A/C ON. A/C OFF = OEM+ (Timer)
Opposite of the option above, this option will allow a timer vs no timer state.
So when you have the A/C OFF, the pops will be on with the "OEM+ Timer" and only pop for a short duration when you let off the throttle, but when you turn the A/C ON, the pops will become always active.*Requires working A/C System*
•ms45.x •msv70 •msv80
Active when Cruise Control is ON
Similar to the AC toggled option except with Cruise Control.
When Cruise Control is toggled ON (light on the dash) pops and bangs will be active. When Cruise Control is turned back off, pops and bangs are turned off.
If you are opting for the FLAME option, we suggest selecting this option for the best chances of flames.
•ms42 •ms43
Active when Cruise Control is OFF
Similar to the AC toggled option except with Cruise Control.
When Cruise Control is toggled OFF (no light on the dash) pops and bangs will be active. When Cruise Control is turned back on (light on the dash), pops and bangs are turned off.
If you are opting for the FLAME option, we suggest selecting this option for the best chances of flames.
•ms42 •ms43
ALWAYS ACTIVE
Lastly you have, always active. So no matter what state your A/C is in, whether on or off, you will have endless pops. WHENEVER you let off the throttle and begin decelerating, your pops will begin without end.
If you do not have a working A/C system, you should select this option if you are opting for the FLAMES option.
•ms41 •ms42 •ms43 •ms45.x •msv70 •msv80
For M3s (MSS54/HP ECUs) - E46 S54
Ultimately we offer the same different level of aggression as our Non-M tunes; OEM+, Mild, Aggressive, Aggressive + Flames.
Pops/Bangs/Overrun will be always active no matter the mode and or A/C state. With standard functionality and OEM like behavior. With stages 1 and 2, you can have light burble and pops upon lift off of throttle/deceleration.
You will also be able to opt for more aggressive consistent pops in Sport mode and/or in both Comfort and Sport mode.
Pops will be much more prominent and loud, you can choose to have this only above a certain rpm. By default, we select anything above 4500rpm.
With Stage 3 (with flames), we will always default to have increased aggression in Sport Mode above 4500 rpm. This is where you will hear and see loud bangs and flames emitted from the exhaust.
For M3s (MSS60 ECU) - E9x S65
We offer a variety of aggression levels and ways of enabling pops/flames to best suite your needs. The S65 ECU has very little and poor control for pop/flame functionality so we have spent a lot of time even on this feature to offer better and more desirable behavior compared to anything the platform had seen before. Just because we want a bit of a smile on our face and some action, doesn't mean we want the car to sound horrible, have excessive rev hang, or hesitation and bucking.
When purchasing your S65 tune, you can select your aggression type, from
Mild to
Aggressive + Flames.
In the text box, you can let us know how you want the pops to be activated (some of which are exclusive to Chaos Calibrations):
- Random/Inconsistent/Occasional Like OEM
- Specific RPM Range (Let us know)
- Always Active
- Active only in Comfort
- Active only in Power
- Active only in M MODE
Keep in mind not every one one of these options is available for all ECUs. This guide explains the options available per ECU type.

