I had a custom made 2.25 cat back system made for my 99 civic ex (auto). It had made a rattling type sound around 4000 rpm and I made a thread about it then. I went back and had a resonator put in and it took care of it. Recently my cat went out so I bought a magnaflow highflow cat (2.25) and had it put on. Now the exhaust is making that rattling sound around 3000-4000 rpm again. Any ideas?
Thanks!
Thanks!