Hate to tell you but the exhaust soundtrack is all fake on the S5. It's just a rumble speaker. I thought it only contributed a little but I turned mine down to 50% and it is pretty much all the noise gone.
The only good thing is turning it down 50% made the car much much faster. When I have...
I fitted a catch can kit from ECS Tuning USA. Very expensive but it catches a fare amount of creamy black goop that would have probably stuck to the valves. This would need walnut blasted off at some point so it was cheaper than getting that done. Of course I've never seen the valves so...
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