I have an 06 ss/sc with cai and catback to a big ole 4in tip fart can, anyway at regular cruising my afr's are perfect but at full throttle they become extremely rich, around 11 on my aem wideband and the rear of the car is always covered in soot. My buddies say they can see black smoke rolling when I take off from a dead stop a low rpms. Any ideas?

 

Take the **** can off and buy a magnaflow or something along those lines and tune it.

 

Tune? Cat/catless? Not sure if 11s (high or low 11s?) is that bad, most LSJ's blow black smoke when you step on it

 

It's just super rich and I'm untuned and catted

 

I've heard GM tunes, both stock and stage 2, are super rich so you don't blow the car up.

 

Makes perfect sense and was what i assumed was the reason. Thank you sir

 

Very true, better to flood it than blow it up!

 

What cat back, or is it just a muffler? Because if it's the Ark Performance cat back the tip looks soooooo stupid (I have it) but it's one of the better (in not near the best) sounding exhausts.

 

It's a eBay catback 2.5" stainless to the TSUDO 4" fart can. I hate it with a passion.

 

Lol, you need an upgrade then.