Discussion Starter · #1 ·
Hey guys, I just installed a pair of Cats earlier today (This and it's counterpart) and my car is significantly louder. I installed new o2 sensors with them (delco) and tightened everything down very well. Could it be that pretty much everything behind the cats is still stock? I am waiting for some more free time before I install my cat-back, but am wondering if this loud exhaust will diminish a little over time or change completely once the cat-back is installed?