exhaust question

oppi-10

yin yin
so my old exaust was like swiss cheese, so i got a new one but i got it all strait pipe with 2.25 piping, but around 3-4 grand it makes like a tinny noise, is this just because i dont have a cat on it, and if i put a cat back on will it go away. someone told me if i put a double baffel resonator on it will fix it. what do you guys think? thanks
 
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