SL55 X-Pipe (Secondary Cat Delete)

Subscribe
Mar 10, 2021 | 11:58 AM
  #1  
Hi All,

After a lot of digging here and on YouTube it appears that no one makes a x-pipe component that would allow for a the removal of the secondary cats, and it be welded/bolted in its place. I'm doing LTH's and would like to remove everything to the mufflers and replace with 3" 304. I know all of that will need to be fabricated by a shop, but I was hoping to find an x-pipe somewhere that I could pre-purchase vs having made custom.

I guess my first question is, does anyone know of a x-pipe system? Second question, if I do need to have it custom fab'd...what would you guess the cross section of the X be? I was thinking around 5"

As Always, thanks!

EDIT: Third question....do the secondary cats with the crossover really do anything to restrict flow? Is a x-pipe really needed?
Reply 0
Mar 10, 2021 | 12:58 PM
  #2  
https://global.cksperformance.com/pr...hausts-headers
Reply 0
Mar 10, 2021 | 01:15 PM
  #3  
Thanks meadows, I don't know how i missed that bit of kit. Is the 2.5" diameter an issue?
Reply 0
Mar 10, 2021 | 01:35 PM
  #4  
Quote: Is the 2.5" diameter an issue?
I can’t answer that intelligently. Probably depends on your headers.

I have a set of MBH long tube heads I’m procrastinating installing. I haven’t really researched it thoroughly to know what I’ll be tying into or what all I’ll be deleting.
Reply 0
Mar 10, 2021 | 01:42 PM
  #5  
The mbh’s are 3” output which is why I am hesitant
Reply 0
Mar 11, 2021 | 09:47 AM
  #6  
Also, I'm finding not so favorable reviews of CKS, any forum experience?
Reply 0
Mar 11, 2021 | 08:40 PM
  #7  
Just go to a competent shop and have them make one for you. Who knows how fitment will be on a pre made one esp when paired with the MBH
Reply 0
Mar 11, 2021 | 08:59 PM
  #8  
that’s kind of what got me looking in the first place, there’s not a single exhaust shop in my town that will help. I called every euro car mechanic and they all want to do bolt on kits.

Quote: Just go to a competent shop and have them make one for you. Who knows how fitment will be on a pre made one esp when paired with the MBH
Reply 0

MB World Stories

The Best of Mercedes & AMG

Explore
story-0

New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know

 Verdad Gallardo
story-1

6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

 Verdad Gallardo
story-2

Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

 Verdad Gallardo
story-3

Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

 Verdad Gallardo
story-4

8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

 Verdad Gallardo
story-5

Flawlessly Restored Mercedes 190E Evo II Heads to Auction

 Verdad Gallardo
story-6

Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

 Verdad Gallardo
story-7

Mercedes EQS Gets A Major Update: Everything You Need to Know

 Verdad Gallardo
story-8

5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

 Verdad Gallardo
story-9

Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

 Verdad Gallardo
Mar 12, 2021 | 07:09 AM
  #9  
Myles

I'm about to have MBH LT headers installed in NC. If you're anywhere near me try CW Performance in the Raleigh area.

I don't understand why you'd remove anything other than perhaps the primary cats. The secondary ones don't really restrict flow and you can only get away with that change if you live in a state without tail pipe emission checks.

Bill
Reply 0
Mar 12, 2021 | 07:12 AM
  #10  
Thanks bill, I’m in asheville so Charlotte or Greenville would be closer but I’ll keep them in mind since it looks like I’m going to have to trailer it anyways.

I had planned on removing the resonators too, so instead of trying to patch in at three different places I was just going to run from the header to the mufflers
Reply 0
Mar 12, 2021 | 07:16 AM
  #11  
Call Curt at CW, he's the owner and tell him I sent you. I talked to numerous shops in NC before selecting this place for all my work. The guy knows SL55's like the back of his hand, actually has an SL 55 he races.

They're not just a performance shop either, they're MB experts and do all servicing, something else I really like about them.

Reply 0
Subscribe
Currently Active Users (1)
 
story-0

New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know

Slideshow: Mercedes-AMG's new electric GT 4-Door Coupe trades combustion for software, synthetic noise, and more than 1,100 horsepower.

By Verdad Gallardo | 2026-05-20 20:08:15


VIEW MORE
story-1

6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-2

Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-3

Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-4

8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE
story-5

Flawlessly Restored Mercedes 190E Evo II Heads to Auction

Slideshow: The 190E Evolution II shows how a homologation necessity became a six-figure collector icon.

By Verdad Gallardo | 2026-04-22 17:53:47


VIEW MORE
story-6

Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

Slideshow: Mercedes is turning one of its core nameplates electric, and the details show just how serious this shift is.

By Verdad Gallardo | 2026-04-21 13:58:06


VIEW MORE
story-7

Mercedes EQS Gets A Major Update: Everything You Need to Know

Slideshow: Faster charging, longer range, and a controversial steer-by-wire system define the latest evolution of Mercedes-Benz EQS.

By Verdad Gallardo | 2026-04-15 10:35:34


VIEW MORE
story-8

5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

Slideshow: These overlooked Mercedes-Benz models never got the spotlight, but they quietly delivered more than most remember.

By Verdad Gallardo | 2026-04-13 19:35:45


VIEW MORE
story-9

Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

Slideshow: A well-used 1991 Mercedes-Benz 300D with more than one million miles is now looking for a new owner, and it still appears ready for more.

By Verdad Gallardo | 2026-04-10 10:05:15


VIEW MORE