Quote Originally Posted by matt5112 View Post
They don't do this unless your car is knocking.

So yes, GM could have designed a better exhaust, but the key is, nothing but 91+
When did exhuast systems effect the cars ability to handle detonation? Don't these cars have knock sensors? Secondly I'm not sure if the car ever had 87 ran in it, I trust my ex enough that she didn't. i believe the proper term you want to use is pinging.