03clk55

Hi guys,

I have a 2003 clk55 and am thinking about removing the 2 secondary cats. Will this trip some sort of CEL. Also, has anyone had issues passing smog in CA with removing the secondary cats.

Thanks...

dohcfiend

can't comment on the CA emission laws and on the w208's deleting the secondary cats are safe. as for your car, just look to see if there are o2 sensors after them if so, dont touch them and if not you are fine.

M-bENZ

NO 02 sensors on the second cats but not sure about the CA Law. I took the second cats out and replace with two glass packs in place then straight pipes all the way to the quad tips.

Andy

badblackbenz550

They are not cats just resonators.

03clk55

They are cats for sure...and the o2 sensors are in the bigger cats closer to the exhaust mani.

dohcfiend

i wouldn't bother replacing with resonators, just have them gutted(keep emissions guys happy).

badblackbenz550

There is cats then there is resonators that look like cats and then there is the resonator...

03clk55

Not on mine....no resonators.exhaust mani, 2 cats, 2 more cats, muffler.

dohcfiend

mine has 2 cats, 2 more cats, large resonator, muffler. i watched the guy gut them so im pretty sure they are secondary cats on mine anyway.

bobbyjo9

So what did you get by gutting the secondary cats?

drone?
sound?
sniffer test???

Just curious bout the pros cons. Not concerned bout the performance.. that should be a given improvement.

dohcfiend

i can't recommend this to everyone depending on state laws but i gutted all 4. i got sound and hp. the sound was okay but the resonator needs to be changed. im not worried about it atm bc in time im redoing the whole catback system.

unlukky

Hes right. 03- no resonators.
01 and 02- 1 resonator, just cut it out.
Secondary CATS shouldnt be a problem taking them out too.