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Discussion Starter #1
I use to hear a big difference in growl noise in my exhaust in sport mode versus non sport mode.
It now seems the exhaust sounds about the same regardless of sport mode or not?
Car otherwise seems to be running fine.

I have a 2013 Grantursimo sport.

Any ideas?
 

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you ought to be able to tell if the flappers work at idle on cold start pretty quick and easy. beyond that, i haven't seen any exhaust flaps get stuck closed, more so they stay open when they shouldn't be due to vacuum source, vacuum lines, vacuum reservoir...
 

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Discussion Starter #5
Get underneath and check the valve movement. Probably jammed.

C
Got underneath and both pistons seem to go in and out like I assume they should.
I have an appt. with a dealer next week to hopefully figure it out.
 

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Does your center display show Sport Mode when button pressed? Just to confirm you are actually going into sport mode? Also do you run manual as when in sport mode? Thats the only time my valves stay open 100%,
 
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