Well it turns out my problem with the rattling of my exhaust system has been solved. I have a apexi n1 universal muffler welded to 2.25 inch pipe with no resonator. I hear something rattling in my muffler so im guessing it is blown, i think bc i had my silencer in, it did something. i just need help to maybe how this may have happened, was it the silencer, started rattling when i took that out. My piping was really crappy and has a few major crushes, meaning badly bent in. Would this be effecting my perfprmance also?

 

add a resonator and make sure the piping isn't rubbing anything.