longbow0404

Good day


Do you still like the noise it makes? any issues or things I should be aware before I take the car to the shop.


Im planning on doing the same


Thank you

kuba.95

Yup. I still love the noise. Made it sound more like a V8 without turbos (Made it especially made in 3-4th gears when driving around 100km/h), and made it about 20% louder. Still plan on getting downpipes from Rebellion though to further enhance the sound. Only issues I can think of are emission related which depend on where you live. Warranty isn't really an issue since the secondary cats don't do much, and it'd only affect the exhaust warranty from what I know. Also I haven't had any issues with my car at all so far.

CT-AMG

US Owners: Would this cause us to fail out emissions tests?

longbow0404

Thanks


Im gonna do it and add pictures and videos in here if you don't mind


thank you again

kuba.95

I don't mind at all.

I'll probably add some more vids on here as well later on in the year.

No problem. Hope that you're enjoying you're beast, and I hope that you'll enjoy the sound improvement!

longbow0404

I'm loving the car!!! Thanks

I just did mine but I do not notice a big change in sound down low or at highway speeds from inside the car. Now if I stand in the back of the car, there is a difference. Still gotta drive it a little more.




The exhaust with the plastic panel removed





Secondary cats out of the way





Test fitting the pipes





Driver side done





Passenger side done

Jojipoji

Interesting that it didn't make it that much louder. Do you have performance exhaust?

longbow0404

Yes I do have the performance exhaust. I guess the secondary cats are not that restricted. I will take pictures of them and post them up here for all to see.

longbow0404

whitehotC63S

Do you notice any difference in power?

matt11212

If tuned properly, you should have no problem unless they do a visual test. Depends on where you live really.

And I have had my downpipes in for about a week now, its really loud when valves are open and full throttle but cruising around in comfort is barely more audible than stock. Hope this helps! If anything get downpipes! They are the way to go

longbow0404

not enough to notice!!! maybe you will be able to tell by using a dyno

black63s

Did this throw a check engine light for anyone?

longbow0404

No check engine light if you do the rears only

Andyroo

If anyone is researching whether or not to do this mod, here are my thoughts having had it done: https://mbworld.org/forums/c63-c63s-...exhaust-9.html

juse

but there is 2nd lambda zonda before 2nd catalyst
it does not affect it at all?

Andyroo

Sensor is after 1st cat not 2nd, so no CEL.

juse

1 before 1st catalyst, 2nd between 1st and 2nd catalysts
if i understand correctly 2nd catalyst creates exhaust back pressure so lamda zonde can correct air–fuel ratio if there is something wrong with fuel
if there is forward flow without 2nd catalyst then lamda zonde will not have enought time to "sniff" exhaust gass and to amend to engine's work

Andyroo

No one with the mod has reported a CEL so it looks like it's ok! The exhaust guys who did the work said there shouldn't be any problem based on the locations of the sensors. The secondary cats are supposedly quite free-flowing anyway.

Phorte

Did the software update last week and just had the secondary cats deleted today... it's gone from strength to strength!

Now with the secondary cat delete, it's pops so much more all the time. Definitely a lot when just letting off at only 2.5k rpm and definitely more when downshifting too. Idle is a tiny bit louder but similar to the W204, exponentially gets louder the harder you go. Love it!

skim7x

Can you post a vid?

jakesza

Really want to do this, just worried around warranty, MBSA full of ****.

ScottsC63

Ryane8182

KJ

I don't think there's any loss in power at all. If anything, you would probably gain a few horsepower.