well basically when i bought my turbo system, it came with a custom made downpipe. i had installed it and rev hard for about 1 week. my pipe just started "RATTELING" for some reason... i pulled it out and took a look. it was the whole pipe form the cat back, back (stock pipe). i dont know wats causing that noise, wat can i do to stop it... do i really have to replace it with a new one??... well any tips, lemme know... thanks...