So i bought some test pipes off a member here and they came in the other day. I noticed one of the pipes was bent on the resonator and i could shake it and hear something clanking. I noticed the spot welds had came off. So i had a friend spot weld them back. The noise went away. now......when i installed them, on a cold start there is a LOUDDD metal rattle noise which goes away after the car is warmed up, and when the car goes up on the rev's the sound comes back at certain stress rpm's.

I got under the car and when i hit the test pipes the noise seems to be coming from that damaged test pipe's resonator. Is there anything that can be done or is the resonator blown?