1st how do I know if I have limited slip in my SS? I see the codes in the glove box but dont know what code represents the limited slip option?

2nd what the hell is that thing bteween the sunroof switches? It looks like a round grill with vents cant find any use for it and not in owners manual?
Thanks

 

It's the Onstar microphone.

As for the RPO codes:

https://www.chevyhhr.net/forums/show...ighlight=codes

 

That round thing is the mike for on star,

 

Check the RPO sheet in your lower glove box. The code is G85.

 

Well, I think we all know the way to see if you have a limited slip :)

 

touche

 

Rotflmao :)

 

If you have the auto transmission you don't have limited slip differential. It only comes with the stick. If you have a '09 the LSD also comes with the Brembo brake calipers in the front. Those are about twice as big as the rear calipers plus the logo is on them.

 

Microphone for the On-Star and Blue Tooth Phone if you cell has that capability.

 

Its the cooling duct for the flux capacitor.