[hammerhead1985]

I have a 2010 CC V6 Frontier and noticed that it has 4 cats: 2 per bank. The downstream cat on each side has no O2 sensor after it which makes me wonder if there would be any advantage to deleting the downstream cat on each bank? It shouldn't effect any diagnostics or OBDII since there are no sensors after but might help some in less restrictive exhaust....

 

[rcr_kx250f]

except for the part where you have to smog it. it will fail a visual inspection then, even if it doesn't go over emissions. if you really want performance, get DT headers and exhaust, retune with uprev and find somewhere to sneak around smog.

 

[dubie2003]

You are talking about gutting the secondary cats. It has been done by others and there are no issues so far.

Now for there being no sensors past them, I am not sure about that. I thought there were o2 sensors after the primary cats and then "heater" sensors after the secondary cats.

 

[hammerhead1985]

I didn't look too far into it, but I thought I only saw O2 sensors after the first cat on each side. I'm not worried about visual inspection though...

 

[rcr_kx250f]

if youre going to the trouble to gut them, might has well set if up with true duals all the way back.

 

[hammerhead1985]

I had it up on a lift today at the shop and it only has sensors after the primary cats. Guess I'll probably gut the secondary cats one night this week. They have flanges to unbolt them on both sides on both cats so it'll be easy to unbolt, beat, and bolt back up!

 

[PutMeInTheSky]

Write up with pics? Especially if you go true dual!!

 

[Sangster]

did u ever gut those cats? If so, did u take pics? Results?

 

[Newman]

http://www.clubfrontier.org/forums/f11/good-bye-secondaries-39722/

http://www.clubfrontier.org/forums/f11/secondary-cats-delete-results-40273/