Secondary CAT delete

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Apr 16, 2020 | 06:47 AM

#26

Shazbot302

Junior Member

Joined: Apr 2019

Posts: 55

Likes: 16

2019 C63S

Will the car drone after the second Cat delete? Has any done this on the facelifted C63S?

Dec 12, 2024 | 05:40 PM

#27

Eric A

Newbie

Joined: Nov 2024

Posts: 1

Likes: 0

2018 C63S Coupe

C63s secondary cat delete.

I just got my 2018 C63s coupe (pre facelift) it has the performance exhaust and I love the sound but I want a bit more umpf. I read through the thread but didn't get a definitive answer. I wanna know if the car gets any drone and does the valve rattle become an issue right away or its due to a faulty H-pipe valve? My car currently doesn't have any valve rattle.

Dec 12, 2024 | 10:35 PM

#28

mars c63s

Member

Joined: Feb 2022

Posts: 120

Likes: 35

C63s

Quote:

Originally Posted by Eric A

I have a pre facelift too... And can honestly say the secondary cat delete is the best bang for the buck. The sound is the same just a bit louder and deeper.... With catless downpipes you may, depending on brand, end up with some raspiness... But with the secondary cat delete you retain most of your stock pipe so no change in the frequency, just the volume and some added pops and burbles. I mainly did it because when the dealer flashed my ecu, the car had quieted down and with this mod it's back to its previous glory.
When you close the exhaust valves on your center console, the car goes back to sounding like nothing ever happened. Just in case, the missus (or mistress) says "we need to talk"....