MIKESV8

sup guys, sorry i haven't really been posting on here at all, although i definitely have not been out of the car world by any means.

i want to pull a little more power out of my E63 without spending much (who doesn't, right?) i know that removing the secondary cats on either the E63 or E55 will yield more power, but on the E63, i have only seen people do it with the removal of their resonators as well, and i really am not a fan of the way they sound with both resonator and secondary cats deleted. my resonator currently removed gives a perfect sound

my question is this: i still have my resonator in my garage, should i have this shop reinstall it and remove the secondary cats, or would it impact performance if i put the resonator back in? i know deleting the resonator doesn't give any gains, but removing the secondary cats does. i just don't want it to be excessively loud. also, is there any chance of my CEL coming on or anything else i should be worried about when removing secondary cats like the smell of gas all the time or anything? i would have EC reflash my ECU if i did remove the secondary cats. thanks in advance.

Adonis89

I'm curious about this also. I want to do only a secondary cat delete, no resonator delete. I did a lot of research about this for the 07 w211 E63 and barely found any info in regards to how much rwhp you pick up with just a secondary cat delete. I was recently told I would pick up about 15-20rwhp.
I that true?

timeToy

Renntech claims +10 HP and +15 LB-FT with their secondary Cats remove:
http://www.renntechmercedes.com/www/node/888

c32_amg

Let us know how you get on as I'm looking to delete the secondary cats too but leave the resonator in as I dont want any drone.

Was speaking to an exhaust place today and he advised the same removing the secondarys and replacing them with an x pipe.

pnoyworx

No drone from removing resonator. I have secondary delete and resonator w/ xpipe.

c32_amg

So you have secondary cat's deleted but still have the resonator in place and the whole system is oem?

Did you replace the secondary's with straight pipes or x pipe?

Any video's

Adonis89

Yes that is also what I was told by my shop. They quoted me $800 to take out 2nd cats and add in X pipe. That's a bit steep for this mod.



I heard that just deleting secondary cats adding X pipe in place and leaving resonator is the best way to go. From what I was told the resonator doesn't rob any power and it is an X type inside. I personally don't want a very loud car, just a little more rumble. Also heard 2nd cat delete will still pass smog test but not a visual if they look under.

AMG55TECH

go for a secondary catt and resonator delete, weld in an x-pipe and your good to go.

Adonis89

Does piping size make any difference? Like 2 3/4 or 3 inch?

c32_amg

Thanks for that, confirms everything I'v been told and thought

looks like we both looking for the same thing.