i am running a b18b in my 94 hatch i started off with some dc headers with a sp GReddy cat back after a while i kept hearing a rattling sound ppls told meeh it was probaly my cat so i replaced it with a megan test pipe sad to say still hearing the same sound but now it hella louder what do you guys think it could be

 

im having the same rattle around my cat too, just put in my skunk 2 exaust in.

 

try the heat shield