Want to get rid of the reactive muffler on the cav and give it to my buddy for his civic, will his stock muffler work on the cav??  it's a 2003 cavalier
Matty
 
it should fit...i believe both use 2" piping, so I don't even think you would need an adapter.
 
 
Civic mufflers are pretty restrictive, and you probably have a bigger engine, but any performance losses aside....it should work, it's just a muffler. 
 
 
Hehe, I bought my muffler from my bro-in-law after he sold his civic, he bought it new and it had maybe 20k miles on it. But god I love how it sounds. (sounds MUCH better on my Cav thean it did on his Civic btw)
 
 
Is it the grape shooter one or is it from a VTEC Honda?
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We all drive in a yellow Cavalier...