Originally Posted by pomansouth
does the ls have one also, my ls did it
No. :thinking: GSR's is running the intake butterflies.
All engines will make a noise when you shut them off, there's just a lot of factors involved in whether you hear it or not. Soundproofing, intake design, blah blah blah. I've just noticed that the GSR's is particularly loud and attributed it to the complexity of the vacuum system.