Okay I had high flow cats put on but for some reason they killed out on me, they are all dark purple and blue on the outside, an exhaust shop guy said that when you get aftermarket cats sometimes the different location than stock cats can cause this sort of thing. So what do you think is the best solution? I could buy more cats, which is just annoying, I could do test pipes, which means I need someone to tell me where to pass emissions, or I could do something else that you suggest. I'm open to all comments.

 

the discoloration is normal, unless you are experiencing power loss and weird noises, then just the discoloration is not a concern.

 

yeah... it rattles... lol so im pretty sure they are blown

 

so any advice? im sure its blown by the rattling sound