I currently don't have one on my car, and the exhaust smells so bad that you stink after driving the car or letting it idle for awhile. If I put one back on my car, will it help? I can put it behind the cutout, so I could bypass it if I needed to. The car is running rich, but I thought this might help as well as a new tune, once I can figure this datalog thing out.

Thanks in advance.

 

CAT probably won't do much for running rich but +1 on the exhaust smell. Took mine off when I added the LT's and it now smells like a vintage 1970 or lawn mower was running in the garage whenever I crank it up. Seriously thinking of putting a CAT back on, my car is looks to good to stink like that for a few HP.

 

Yeah, I know it won't help with the rich condition, I was more concerned with the smell

 

Rich condition? The hydrocarbons will burn up in the cat and fix the smell issue. But the richer the AFR, the faster the cat will burn up.

When I removed my cat after it clogged (from a rich condition), I noticed the fumes are bad enough to about kill you if you're by the tailpipe.

 

I am experiencing the same thing, both smell and running rich. I plan to add a high flow cat in front of the cutout and after the Y-pipe. Just need to decide which cat to get (have about 12-14 inches of Y-pipe tail where I plan to have the cat). Any suggestions??

Thanks!
Mike