Hello all,
I've had my W211 E55 for just over a year now. I use it strictly for weekend cruising or taking it up to the drag strip and have had quite the experience so far. It is a high mileage example at 185k currently- however I am still running mid 12s in the 1/4 mile and put down over 400whp on a Dyno with only 'mods' being a new intercooler pump and a MKULTRA Stage 1 TCU tune!
<, For those that want to check it out.

Anyway, I'm finally putting some more work into it and am currently in the middle of replacing the rear air bags with Arnott replacements- and want to add some mods for this summer's track runs but have some questions for those wiser than I:
-eBay Long tube headers are on order (taking a chance here I know)- I'll be going no cats, leaving everything else stock- any tips/advice ? They are the cerakoted versions and I'm debating on wrapping them to further keep engine bay temps down.
Also will order the OE manifold gaskets with studs and hardware.
-I have a cart ready from UPD with the 83MM Supercharger Pulley/Tune, Air intake spacer, and belt wrap kit.
-All other pulleys are from UPD as well
-Will be upgrading to the SLR TCU tune.

Questions/concerns as follow:
*010 IC pump is already installed- thoughts on the PLM XL intercooler vs the VRP? I DO in fact have the secondary long oil cooler on my 04 which I like the idea of the PLM having attachment points for, however i've read about some 'misinterpreted' capacities on the PLM and am trying to get the most updated info.

*On one of my last runs last year, the car felt..squirrelly..? Hard to explain but kind of like it was wandering about halfway down the track, not felt in the wheel just the whole body kind of swaying. After some research it was said the rear toe arms go bad and can cause that issue. All my suspension seems tight with no play, and I've already replaced balljoints and front lower arms. So, i'm hoping I can get some new arms but the ones I wanted (MBARTS) don't seem to be in business anymore as they haven't responded to me. Would stock replacements be 'fine' ? Or am i going to be fighting the same issue? The car is on brand new (year old now) Continental EC Summer tires.

*Datalogging- I've researched and a lot of the posts are from over 10 years ago- is there any plug and play options currently being used by you guys?
*Does anyone work at MB? I'm trying to get a VMI report for this thing but my dealership won't provide it!

If the car survives this and if i break into the 11s on the 1/4 mile, i'm going to celebrate by putting Cams in it to 'wrap up' the power mods- but cannot find any write ups or info on install or what I would need to do to replace them. Any ideas? I can find my way around an engine, but i like doing research prior and even Alldata is vague on the disassembly.

Tips/advice/constructive criticism is always appreciated. I think my mod list is "OK"- I'd rather not get into modding the fuel system yet unless absolutely necessary...

Thank you,

 

FWIW, maintenance records are stored in your car's Central GateWay (CGW). You can pull them using ASSYST-ASSYST Plus in STAR/Xentry. Days since initial CGW power up, days since previous service, total mileage and mileage since last service plus service items confirmed.
I have a post on this in the sub-forum. If you PM me your email address, I will send you about 30MB of technical info that was used to familiarize MB techs with the W211 when it was first offered to the public.
Oh yeah, if you haven't upgraded your stock 40-amp fuel pump relay to a 70-amp relay, do so ASAP.
Check out my thread on "E55 fuel pump circuit information". I refreshed it a few days ago.
@sicamg may be able to provide guidance. His E55 "only" does 158 mph through the 1/4 mile. Definitely not a slacker!

 

Now THAT's interesting- what are the odds that all that history was actually plugged into the system though? Say they brought it in for a random issue and didn't actually hook up the scan tool?

Opening up ANOTHER tab to read up on that- PM SENT -THANK YOU.