SL-Class (R231) 2013 on: Discussion on the SL550

SL/R231: R231 Modifications Thread

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Old 03-21-2021, 08:20 PM
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SL550
R231 Modifications Thread

I've noticed that there is a lack of information regarding mods for the R231. So I thought that I'd start a thread on documenting some of the possible modifications that can be done, along with what mods we have done to our cars. The mods on this list may not be possible on some models of cars, such as those with or without the AMG styling package, or with different motors.

My SL has had a pre-facelift SL63-style lip spoiler, 295's in the rear, and the middle mufflers deleted. But I know that a ton of other mods are possible too.

Exterior:
  • Spoiler and lip spoilers
  • Wrapping
  • Front lip
  • SL63 OEM grille
  • SL63 rear valence (may require SL63 tips as well)
  • 3rd party grilles
  • Various bodykits
Interior:Wheels:Suspension:Engine/Transmission:
  • Renntech tunes https://mbworld.org/forums/sl-class-...ispreloading=1
  • Eurocharged tunes
  • Brabus tunes
  • OETuning tunes
  • VividRacing tunes
  • Kleemann tune
  • AMS Alpha tune (SL63 only, fit NOT confirmed)
  • Weistec tunes
  • Weistec meth injection (not on SL500 or SL550)
  • Racechip
  • Renntech transmission upgrade (pre-facelift only)
  • BMC air filters
  • Ultimate Performance & Development intake (SL63 only)
  • Ultimate Performance & Development air filters (SL63 only)
  • Various other intakes
  • Renntech Intercooler kits (AMG only)
  • SprintBoost (adjusts throttle response)
  • Transmission "Agility" mode programming
  • Weistec transmission pan
Exhaust:Brakes:Other:
  • Renntech LSD (AMG only, not sure if non-AMG models compatible)
  • Renntech adjustable links (AMG only, not sure if non-AMG models compatible)
  • Smarttop

Last edited by Keon; 02-08-2024 at 10:31 PM.
Old 03-22-2021, 05:37 AM
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You omitted the most useful mod.
Smarttop.

I have
1) SmartTop
2) Boot lip spoiler (facelift version).

I purchased my car new and specified everything else that I wanted so (for me even 4 years on) no other mods needed (although I do like the Panamerica grille).
Old 03-22-2021, 05:50 AM
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You forgot the most easy/cheap and HP booster and incomparable cooling kit, the water/meth injection kit, to me the best upgrade overall on a turbo car, I got mine from Weistec (also a No1 tuner) because all has been prepared for your engine type
You totally forgot Kleemann to me one of the 3 best tuners

SprintBoost (adjusts throttle response) is JUNK
Eurocharged tunes not really good
OETuning tunes a joke
VividRacing tunes a joke
Racechip a joke

Last edited by BenzNinja; 03-22-2021 at 02:17 PM.
Old 03-22-2021, 07:42 PM
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Originally Posted by BenzNinja
You forgot the most easy/cheap and HP booster and incomparable cooling kit, the water/meth injection kit, to me the best upgrade overall on a turbo car, I got mine from Weistec (also a No1 tuner) because all has been prepared for your engine type
You totally forgot Kleemann to me one of the 3 best tuners

SprintBoost (adjusts throttle response) is JUNK
Eurocharged tunes not really good
OETuning tunes a joke
VividRacing tunes a joke
Racechip a joke
Who makes a meth injection kit specifically for the R231?
Old 03-22-2021, 08:35 PM
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Originally Posted by Keon
Who makes a meth injection kit specifically for the R231?
I hope this is large enough




Old 03-22-2021, 09:27 PM
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Originally Posted by BenzNinja
I hope this is large enough



Thanks, after a bit of digging I found on their website that they are not compatible with the 4.7 v8, but rather the 3.0 V6 and AMG motors.
Old 03-22-2021, 09:52 PM
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Originally Posted by Keon
Thanks, after a bit of digging I found on their website that they are not compatible with the 4.7 v8, but rather the 3.0 V6 and AMG motors.
hum hum
you didn't dig deep enough
what about the V12 twinturbo
I have that kit on mine
Old 03-23-2021, 12:41 AM
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2014 sl550
On my 2014 sl550 i have as follows

oetune
mec design earthquake exhaust
sl63 diffuser with tips
bootlip spoiler
Eco mode delete/amg menu activated/transmission agility mode enabled.

no issues with the above mods in 1 year, happy camper





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Old 03-23-2021, 01:27 AM
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Does anyone make headers for any of the R231 cars?
Old 03-23-2021, 10:09 PM
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Originally Posted by billvp218
Does anyone make headers for any of the R231 cars?
I don't think so. I also don't see any reason at all you'd want to upgrade the stock manifolds. Headers aren't going to be worth it, especially considering that the downpipe will be the most restrictive part of the exhaust system.
Old 03-23-2021, 10:11 PM
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Originally Posted by BenzNinja
hum hum
you didn't dig deep enough
what about the V12 twinturbo
I have that kit on mine
Yes, they do have them for the V12 - I mentioned it on my list that the AMG motors are compatible. As for the 4.7, I entered 2014 SL550 and it didn't show any meth kits, but it did when i put 2014 SL400 - so I will not add the 4.7 to the list since according to the website, they don't make a kit for it.

Last edited by Keon; 03-23-2021 at 10:21 PM.
Old 03-23-2021, 10:20 PM
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Originally Posted by toi
On my 2014 sl550 i have as follows

oetune
mec design earthquake exhaust
sl63 diffuser with tips
bootlip spoiler
Eco mode delete/amg menu activated/transmission agility mode enabled.

no issues with the above mods in 1 year, happy camper




That looks awesome!
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Old 03-24-2021, 06:36 AM
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2019 SL450
Mods: Wheels with Michelin Pilot A/S 3 and rear spoiler only on my 19 SL450.



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Old 03-24-2021, 08:20 PM
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Originally Posted by ZCARGUY
Mods: Wheels with Michelin Pilot A/S 3 and rear spoiler only on my 19 SL450.


The deep-dish rear rims are just awesome. It sucks that you don't see them anymore!
Old 03-27-2021, 12:20 AM
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I've updated the list with some new stuff. I'd also really appreciate if this gets stickied so it's easily accessible for new R231 SL owners.
Old 03-27-2021, 03:59 AM
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It would be more helpful if there were links to everything, even though most or all of it could be googled

Some additional items:

UPD sells an intake, and also some lightweight pulleys FWIW: http://ultimatepd.com/air-intakes/mercedes.html
Wavetrac LSD (part 48.309.185WK) ... not sure if only for AMG
AMS has tunes, intakes, and cooling mods.: https://www.amsperformance.com/produ...mercedes-benz/
VRP has several different items: https://www.vrpspeed.com/product-cat...mg-m157-5-5tt/

Last edited by billvp218; 03-27-2021 at 08:03 PM.
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Old 05-25-2021, 08:13 PM
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2014 SL550
Modifications

Keon, I appreciate your post. It says a lot but doesn’t tell me much. I have a 2014 SL550 and I cannot get a clear answer on what fits and what doesn’t. From what I have found all mods fits the SL63 model. I’d like to get a rear spoiler, possibly mods to the front clip but when I go to various sites and put in my model it comes back as doesn’t fit vehicle. I also need a front spoiler scrape guard, any thoughts?
Old 05-25-2021, 08:14 PM
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Originally Posted by Myron Nix
Keon, I appreciate your post. It says a lot but doesn’t tell me much. I have a 2014 SL550 and I cannot get a clear answer on what fits and what doesn’t. From what I have found all mods fits the SL63 model. I’d like to get a rear spoiler, possibly mods to the front clip but when I go to various sites and put in my model it comes back as doesn’t fit vehicle. I also need a front spoiler scrape guard, any thoughts?
nothing for the front that is perfect fit & finish

all sl63 spoilers fit sl550s
Old 05-21-2022, 08:16 AM
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2006 CLS55 AMG Sold 2010 E550 Coupe totaled '13 SL550 current and loving it!
If anyone interested, Pressertech makes downpipes for R231 SL 550's
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Old 05-21-2022, 09:29 AM
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Originally Posted by Myron Nix
... I also need a front spoiler scrape guard, any thoughts?
Don't park on a curb.
Old 12-01-2022, 03:23 PM
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Need LED emblem for new GT grill

I am about to purchase a new grill for my 2014 R231 (below). Does anyone know which emblem will fit this grill without me purchasing multiple stars?
https://www.ebay.com/itm/185388409956
Old 12-02-2022, 01:10 PM
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Originally Posted by JettaRed
Don't park on a curb.
Don’t have that problem with ABC .

Last edited by rorywquin; 12-02-2022 at 01:12 PM.
Old 12-13-2022, 06:37 PM
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Originally Posted by billvp218
It would be more helpful if there were links to everything, even though most or all of it could be googled

Some additional items:
...Wavetrac LSD (part 48.309.185WK) ... not sure if only for AMG...
I'm told this will fit my SL450 with some light internal grinding of the housing for clearance. Still considering this, as a few times I've experienced traction control interference and early up-shift occurrences when exiting corners briskly. I am wondering if it will induce understeer, though...as the car is currently pleasantly neutral.
Old 12-13-2022, 07:31 PM
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Originally Posted by Dr. Manhattan
I am wondering if it will induce understeer, though...as the car is currently pleasantly neutral.
Mercedes chose the Drexler clutch type LSD for it’s AMG cars (until it went to the elecronic locking differentials) for that reason. Good mannered for a road car, especially a car with a slight tendency to under steer. It’s a 1.5 way limited slip, Lock under acceleration and deceleration are different/adjustable.
wiki/Limited-slip_differential

Some more basics, more formula car oriented, but same 1.5/2 way LSD (ramp)concept…
https://murmotorsports.eng.unimelb.e...the-difference
https://murmotorsports.eng.unimelb.e...rence-part-two

You can find them more abundantly in E63’s and CLS63’s, but they came in SL63’s too. I believe AMG has spec’d. 35/40 lock on these 2-way Drexler’s. 35% under acceleration and 40% under deceleration. I believe the Black Series HAG215 diffs are set at 40/50.

I found a very low mileage unit for $700. You can swap the carrier if you like, but the diff itself is a bolt in if you find a low mileage unit and don’t want to bother swapping carriers. (probably cheaper that way just make sure the gear ratio is the same). Installation is easy. You don’t have to drop the exhaust or the driveshaft. Just pull the half shafts, unbolt the rear flex coupler, front diff mount and the 2 large bolts on the rear cover holding the rear diff. case in place. Can do it all In one day.

Good Luck


Mercedes HAG215 Drexler/AMG Rear Differential assembly (option 471)

Drexler LSD AMG part number.

AMG Rectifier

Last edited by crconsulting; 12-13-2022 at 08:00 PM.
Old 02-04-2023, 11:37 PM
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Originally Posted by drmorrisj
I am about to purchase a new grill for my 2014 R231 (below). Does anyone know which emblem will fit this grill without me purchasing multiple stars?
https://www.ebay.com/itm/185388409956
Did you do the grill swap? Considering it myself after seeing these online. Beautiful.
Include pictures please if you have.






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