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When the exhaust is set in stealth, the 2 inboard pipes are used. When sport or track is used, the 2 outboard pipes are used. I'm not sure about tour but maybe the 2 inboard ones are used. Mine is either set to stealth or track when I drive 95% of the time is set to track and my 2 outboard pipes are very black.
I'm not one to clean tail pipes because it's a waste of time, IMO. I spend enough time cleaning the brake dust.
But even if you set the exhaust to stealth when you go full throttle, it'll switch to the 2 outboard pipes.
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