What's the connection? I have a borla with MAC Headers, and whenever it's raining outside, the exhaust on the inside gets louder without doubt. Also, I'll hear the exhaust vibrate against the underside of the car while stopped sometimes when it is raining. What's that all about?

 

Well...your windows are up...thats for one so youre gonna hear the vibrations....not all the outside nouse i dunno thats my best guess

 

well how come it's louder when it rains though? when my windows are up and it's dry outside it's not quite as loud.

 

Its a natural phenomenon? another wonder of the world? LoL i havent the shightest clue? other than noise resonance that normally excapes through the window....my buddys car is like that when the window is closed...louder inside than normal