Anyone know the stock muffler's inlet size?  No luck on my search.  Thank you 

2003 Cavalier 2dr. 5spd 
 
 
1 7/8 i think most just call it 2"
JBO since July 30, 2001
 
I'm buying a replacement magnaflow muffler, so 2" will go right on there then right? thanks

2003 Cavalier 2dr. 5spd 
 
 
the piping is 1 7/8" outside diameter. to make a 2" inside diameter muffler fit, you're going to need one hell of an adapter.
JBO Stickers! Get yours today!
 
 
any muffler shop can make a piece to work for your application
JBO since July 30, 2001
 
NOTa2_4 wrote:any muffler shop can make a piece to work for your application
True that, I got my old fart can welded on for $30 everything included except the muffler itself