VIDS: 2nd Cat Delete – Straight Pipe vs H-pipe
Thread Starter
MBWorld Fanatic!
Joined: Feb 2010
Posts: 4,650
Likes: 74
From: Gdynia, Poland
'08 C63 Estate
VIDS: 2nd Cat Delete – Straight Pipe vs H-pipe
So I changed my exhaust setup today from straight pipes to Mike’s H-pipe (powerpipe). I took two videos before and after; both videos taken from the same distance, in the same place with the same camera.
I had one hiccup during the install though – it turned out that both of my primary cats were detached/broken it two pieces and they were only held by 3 screws
I have never seen anything like it. The guys at the exhaust shop welded the cats and told me that if I don't get any CEL then it should be all good.
I don’t know if it’s a placebo effect or the broken primary cats made the car slower or Mike’s H-pipe is better than my previous setup, but the car feels much much faster, especially in the lower RPM. It pulls much stronger from 2000rpm.
As to the sound, I think straight pipes sound better than a H-pipe but I am happy I made the change, because I got really bored with the straight pipe sound.
I had one hiccup during the install though – it turned out that both of my primary cats were detached/broken it two pieces and they were only held by 3 screws
I have never seen anything like it. The guys at the exhaust shop welded the cats and told me that if I don't get any CEL then it should be all good.I don’t know if it’s a placebo effect or the broken primary cats made the car slower or Mike’s H-pipe is better than my previous setup, but the car feels much much faster, especially in the lower RPM. It pulls much stronger from 2000rpm.
As to the sound, I think straight pipes sound better than a H-pipe but I am happy I made the change, because I got really bored with the straight pipe sound.
MBWorld Fanatic!
Joined: Mar 2007
Posts: 2,155
Likes: 14
From: Sydney, Australia
Vath ML63 Brabus C63 SL63 CLK63BS C63BS
Its amazing what a small little piece of pipe can do to change the sound out of this car. I found H-Pipe a good way to remove the raspiness of long tube headers
Senior Member
Joined: Jan 2012
Posts: 381
Likes: 0
From: Toronto
09 C63, 11 Cayenne S
I got the exact same setup and I know what your talking about. Double straight is loud but mike's H pipe hits the spot just nice. I also noticed that after having them on for awhile the sound got a little louder and more refined. Or it might be just my imagination...lol
Trending Topics
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Thread Starter
MBWorld Fanatic!
Joined: Feb 2010
Posts: 4,650
Likes: 74
From: Gdynia, Poland
'08 C63 Estate
In your exhaust you have a 2nd cat and a resonator. The resonator has a small H-pipe built into iy.
Now by replacing your 2nd cat with either a straight pipe or H-pipe, you can change the sound.
At the moment, I have a H-pipe + stock resonator (so double H-pipe).
So I replaced my old straight pipes with Mike's H-pipe.
Now by replacing your 2nd cat with either a straight pipe or H-pipe, you can change the sound.
At the moment, I have a H-pipe + stock resonator (so double H-pipe).
So I replaced my old straight pipes with Mike's H-pipe.
Thread Starter
MBWorld Fanatic!
Joined: Feb 2010
Posts: 4,650
Likes: 74
From: Gdynia, Poland
'08 C63 Estate
Yes, that's what the pipes from Mike do. There is no other way but to delete the 2nd cats and leave the resonators in place.
BTW I saw that the package was delivered today - all good?
BTW I saw that the package was delivered today - all good?
Banned
Joined: Jun 2013
Posts: 1,317
Likes: 3
S550 on order
..going to install the paddles this weekend..the shifter took <5 minutes to swap ...time for the steering wheel...soon 
Junior Member
Joined: Feb 2013
Posts: 45
Likes: 0
From: Boston/Fort Myers
2009 C63
Thread Starter
MBWorld Fanatic!
Joined: Feb 2010
Posts: 4,650
Likes: 74
From: Gdynia, Poland
'08 C63 Estate
I would say keep the resonators. If it's not loud enough for you, get rid of them then.
