Let’s be honest when you hear a car that pops and bangs you can’t help but turn and look, right?
It kind of explains why “Will my car pop and bang with an aftermarket exhaust?” is one of the most common questions we get asked.
But the answer isn’t as simple as yes or no. We explain why an exhaust alone doesn’t always create pops and bangs.
What causes a car to pop and bang?
“Pops and bangs” are created by unburned fuel in the exhaust system.
When excess fuel enters the exhaust system it increases in temperature and ignites inside the exhaust instead of the combustion chamber.
The noise can be exaggerated by fitting a decat or full decat exhaust system. But the main cause of pops and bangs is the ECU and the fuelling of the car.
Does aftermarket exhaust help create pops and bangs?
Even on a standard restrictive exhaust, if the car is over fuelled, there is a potential for pops and bangs. This is why once a cat is removed you can hear the pops and bangs more clearly.
But it does depend on the car, the ECU and the map for how consistent it is.
We’ve proven that our Astra H VXR full exhaust system will pop and bang without needing to be mapped.
It won’t be as loud as a crackle mapped Fiesta ST but even with the stock ECU and the stock mapping, the Astra H VXR with our exhaust will pop and bang.
Our Fiesta ST180 full exhaust system also creates a nice pop and bang without a map, but this could be enhanced with a good map.
Overall, installing a free-flowing decat exhaust is likely to help make pops and bangs louder, but the software and how the car is mapped will impact how much, how often and how easy it is to create them.
Do pops and Bangs Damage my Car?
It’s important to consider how pops and bangs impact your car.
When you map your car to produce pops and bangs, the tuner should ask if your car has a decat or not.
When you create pops and bangs you are essentially igniting fuel in the exhaust system. So if you still have a cat, the pops and bangs can eventually wear the cat down or cause blockages.
Pops and bangs can also damage your Turbo due to a build-up of back pressure from the ignition of fuel.
So if pops and bangs are what you are after, then you will likely need a smooth flowing full decat exhaust system and good modified software from a remap to ensure safety.
Watch Adam explain more about pops and bangs on YouTube.