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I currently have an 05 slk 350 with an Eisenmann race quad exhaust it sounds really good, but I was wondering if anyone knows if there is a tune I could get for pops/burbles
 

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Yes, it's usually unburned fuel on the overrun. Had a tuned Escort Cosworth (turbo) which was very musical in this respect.

Maya ~ Tapatalk
 

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But 'burble' is the correct description. I use 'burble' to describe the sound

Cold start :D

 

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Sorry...not impressed with those 'farting' noises :D
 

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I guess they would need to adjust the fuel shutoff to enable unburned fuel to continue flowing into the cylinders. Not sure this is a healthy option! On highly tuned four pot turbo cars along with wastegate whistles I guess its not an issue.

Maya ~ Tapatalk
 

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The whistle always makes me laugh.

So many kids put a device on to replicate.

If you use manual mode and change higher up the range (5,500-6000)
you get some pop when you lift off the accelerator.

But please, don't ask @Bluebadger how I know.
The 350 is hers >:D
 

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From the web
“To do this we need to do two things: retard the ignition timing to reducing the torque which allows the car to decelerate normally, and run a very lean air/fuel ratio so too much heat isn’t created,which could affect reliability.”

The heavily retarded ignition also means much of the combustion happens with the exhaust valves open (in fact within the exhaust system), and much of the fuel is ignited by the hot exhaust and/or catalytic converter, hence the burbles, pops and crackles you hear from your tailpipe.

“The intensity of the burbles on these set-ups varies depending on the exhaust temperature – how hard the car’s been used. The hotter the exhaust system is, the easier this tiny amount of fuel we add flashes off,”
 

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