I have a feeling the 400 engines are an ECU out job for remaps.
The tuners also have to contend with two versions of this engine, the earlier 333hp motor fitted to our SL and E coupes which is a 3.0 V6tt and the later less stressed model fitted to later cars and the CLS which is a 3.5 V6tt.
I have a feeling the 3.5 offers greater potential and could comfortably realise 400+hp if you were willing to part with your £1200. Just make sure the people you're paying understand there are two versions of 400 to start with.
Thats not a bad price. I paid more than that to get ours custom tuned live on a rolling road and was worth it. Others may say its expensive incomparison to other cheaper remaps offered on the forum but at end of the day you get what you pay for.
I looked into maps for the CLS400 not that long ago as my dad bought one.
Kleeman was one of the few companies that seemed to offer remaping for the M276, though I got a bit of a rude response when I mentioned Brabus.
It seemed expensive at the time, but the gain was good and Kleeman have a good reputation.
Regarding installation - this was the response:
[FONT="]This is so simple to do, 9 out of 10 do it in the drive way. And there is no need to[/FONT] [FONT="]Dyno, unless you have an absolute need for it.[/FONT] [FONT="] [/FONT] [FONT="]If you can do it yourself or with a local shop, no need to be a specialist you can do it with me direct, if not[/FONT] [FONT="]Contact SKG in Brighton, he will know which shops in the London area.[/FONT] [FONT="] [/FONT] [FONT="]Med venlig hilsen/Best regards[/FONT] [FONT="] [/FONT] [FONT="]Claus Ankjær[/FONT] [FONT="]CEO, founder & owner.[/FONT]