OrientBlue3

Hi all, have my ED1 coming next week and on my CLS63, I removed the 2nd resonator and replaced it with straight pipes. It livened up the car a bit and only cost $80.

Anyone do this on these cars or does the performance exhaust valves eliminate the need to do this?

Andyroo

I'm also interested in getting some more feedback from those who've already done it on the W205 C63/S. From what I've seen and read so far (not much!), although the performance exhaust is already pretty loud with pops and crackles, the removal of the secondary cats adds more pops and crackles and bit more of that NA V8 metallic edge, which I want. Here's a thread with some more info:

https://mbworld.org/forums/c43-amg-c...at-delete.html

There are plenty of vids of straight up catless downpipes swaps (which I'm avoiding because it requires a remap to clear a fault code, will need to be swapped out come MoT time, is costly to have installed, and usually requires the standard downpipes to be cut up or the transmission removed), so I'm thinking it'll be somewhere between that and standard (like this for example: ).

maxbeard4

Hi,

I have had the back box removed and cut open, Reason being is due to there being two pipes going through the back box. One for silent mode, and the oter for sport plus etc if you have the performance exhaust.

All you need to do it open the back box up and cover up the wholes on the Larger pipe which is used for sports + etc. This will act as a straight pipe from behind the down pipes. I am very pleased with this mod becauseit cost me £200 and looks completely stock for when it goes back to Mercedes. Also in quiet mode, it is exactly the same.

OrientBlue3

I just want to confirm that it won't cause the dreaded limp mode that some have experienced when tinkering with the exhaust. From what I've seen, the switches that control the exhaust can cause limp mode if tampered with.

PL27

i have the stock exhaust and the exhaust only contains mufflers. After the downpipe there is a straight pipe to the muffler and of course the H-pipe for the valves. I have the IPE Exhaust coming and also having weistec downpipes and tune going in should be done Wednesday.

edit: the IPE Exhaust contains an x pipe from the downpipes instead of the h pipe, stay tuned.

longbow0404

There is no resonators in our cars just Primary Cat, Secondary cat and mufflers. The removal of the seconday Cat will not make a difference on the car (no extra sound, no limp mode etc). Hope that helps!!!

OrientBlue3

Just curious why the removal of the secondary cat wouldn't help? Is it the performance exhaust? It made a nice difference on my CLS.

Andyroo

Couple of guys here had good results: https://mbworld.org/forums/c43-amg-c...at-delete.html

Guilty

Go to page 2

Andyroo

Yeah, I read the whole thing. They're saying that low throttle and highway is similar to stock, heavy throttle is louder and more of a 'V8' sound. Seems good to me!

OrientBlue3

Thank you!

Andyroo

If you do go ahead with it, please post some videos! I'm thinking about doing it next year (I like to space out my mods to keep the car feeling fresh!) so it'd be great to see and hear some more examples.

Enjoy the Ed1!

Andyroo

Found another vid of someone who's removed the secondary cats. It's titled 'straight pipe', but it's clarified in the description that just the secondary cats have been removed. Sounds good!

longbow0404

I have the Performance Exhaust but to be honest I feel no difference at all. Now days the cats are so good and they flow so good that if there is a difference it will be very hard to notice.


I remember doing the cats on my w204 c63 and that made a huge difference but it was an NA and not a turbo car.

OrientBlue3

I did the same on my W204 C63 and it was MEAN. It made less of a difference on the CLS63 but still enough to give it some nice grunt at idle and WOT.

I may look into still it since it's less than $100. Car will be here Monday! It's a Palladium Silver ED1 Sedan.

longbow0404

get a video before and after from behind the car;


ED1 is a great choice... Enjoy your car

Andyroo

By comparison, this is what the exhaust would sound like (ish) with straight pipes from the axle back. The exhaust shown is the catback AWE track exhaust, which deletes the rear mufflers, and is also larger in diameter. See how it compares to the secondary cat delete:


And, for final comparison, catless downpipes:

OrientBlue3

Great post, thank you! That track exhaust is raw!!

Andyroo

It's what we'd all have if we didn't have neighbours!

OrientBlue3

I live in apartments with a community parking garage. Hmmm....

Andyroo

Maybe not the full decat and track exhaust then!

OrientBlue3

i was thinking more of an excuse to do it since I don't have official neighbors like in a regular neighborhood lol.

Guilty

Haha, totally do it. I love firing it up when my parking neighbor is around in his i3

Andyroo

Oh right, ha ha, like stealth owner rather than stealth car...!

From what people are saying though, any mods to the downpipes seem to only be marginally louder at idle and low throttle, so you might be ok