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Exhaust- / Sound Discussion

NAP catback... Yes, it’s aggressive, but a bit sloppy to my ear and the whistling at higher revs is perplexing. For nearly €2K, I’d expect a much tighter, deeper and more refined sound. Hard to do on a four-banger, but it is possible. Will be interesting to hear it with both downpipe (elbow + flex/lower) sections opened up.

 
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Today I noticed that the exhaust in normal mode and N costum mode with the exhaust in sport +, the valve with the car turned on without accelerating, are in exactly the same position. When I accelerate the noise logically alters with the open valve. Interesting do not you think? Yours is the same?
 
NAP catback... Yes, it’s aggressive, but a bit sloppy to my ear and the whistling at higher revs is perplexing. For nearly €2K, I’d expect a much tighter, deeper and more refined sound. Hard to do on a four-banger, but it is possible. Will be interesting to hear it with both downpipe (elbow + flex/lower) sections opened up.


To me that doesn’t sound any better than stock - maybe a bit deeper and I know videos never do justice to exhaust sounds but I just spent the afternoon driving through country lanes and villages in the sunshine and this car sounds amazing as it is - wouldn’t even consider spending that kind of money on an aftermarket exhaust for it.
 
Some observations I have made that I wonder if others can confirm or that might explain other people's findings:
1) When I start my car from cold in normal mode the exhaust is considerably louder than once it's warm. I think it starts with the valve 50% open as it quiets down when I pull away + the sound gets louder still if I put it in N.
2) When you lift the clutch without touching the throttle some sort of anti-stall kicks in and the car automatically revs a little. This is accompanied by a noticeable change in volume although I don't know the reason (maybe to alert the driver that the car is close to stalling).
3) When I get out with the key in my pocket the exhaust valve opens. I'm guessing this is an intentional warning sound.
4) When you're moving, changing driving modes from normal to N immediately affects the exhaust however, I've noticed that at idle when the engine is cold (as if you're demonstrating the exhaust just after starting up) changing from N back to normal the valve doesn't immediately close.
 
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Some observations I have made that I wonder if others can confirm or that might explain other people's findings:
1) When I start my car from cold in normal mode the exhaust is considerably louder than once it's warm. I think it starts with the valve 50% open as it quiets down when I pull away + the sound gets louder still if I put it in N.
2) When you lift the clutch without touching the throttle some sort of anti-stall kicks in and the car automatically revs a little. This is accompanied by a noticeable change in volume although I don't know the reason (maybe to alert the driver that the car is close to stalling).
3) When I get out with the key in my pocket the exhaust valve opens. I'm guessing this is an intentional warning sound.
4) When you're moving, changing driving modes from normal to N immediately affects the exhaust however, I've noticed that at idle when the engine is cold (as if you're demonstrating the exhaust just after starting up) changing from N back to normal the valve doesn't immediately close.
1.) This is even more noticeable if you parked your car with an opened valve.
2.) Same for me, noticed this only if I'm below 1000rpm (while softly parking for example)
3.) Really? My car makes a beeeeeeeeeeep
4.) Same effect if you drive in normal and change to custom without accelerating. Car stays quiet until you push the pedal a bit.
 
I presume if I park up in Normal mode the car still starts in normal mode and the exhaust sound is reasonable?

I live on a quiet street and leave for work early early...just wondering how much my neighbours will hate me?
 
I know what you feel - now you can imagine how does it sound with non-resonated turbo back exhaust ;)
 
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Neighbors are just waiting for you to pull out of the garage, get out to close the door, & BANG - he'll slide down & dispose of the evidence.
 
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Reactions: padigree
Yes - it is how it was. Now I have even larger diameter downpipe (catless), larger diameter flex pipe + the rest of exhaust including custom built rear box.
 
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Yes - it is how it was. Now I have even larger diameter downpipe (catless), larger diameter flex pipe + the rest of exhaust including custom built rear box.
Some kind of straightpipe :D Damn.. That thing must sound like hell. Pay attention on your exhaust valve. I would be scared this thing would be blown out of your exhaust :D poor little valve :D
 
Once remapping becomes more readily available, cold start behavior can be eliminated or made significantly quieter, exhaust valve can be forced closed on startup, etc.
 
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Reactions: TarmoT
Yes, you are right also there is a possibility to turn off or adjust duration of overrun fuel cut off (feature what some people are calling antilag).
 
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