For those who want a little boost by -only- having their SL500'S ECU re-programmed, I have done a quick research and came up with following figures / prices. (Among other things, I also wonder why there is a difference in the output.. Do some companies keep a bigger safety margin?)

Pleased to hear your thoughts, previous experience & comments, also by comparing prices, reliability, etc.

www.evosport.com (Powerchip)
-gain abt 9% (abt 27 hp)
-cost abt usd 990

www.mercedesperformance.co.uk
-gain abt 10-12% (abt 35 hp)
-cost abt usd 1,900

www.hs-elektronik.com
-gain abt abt 7% (abt 21 hp)
-cost abt usd 1,650

www.renntechmercedes.com
-gain abt 3.5% (abt 10 hp)
-cost abt usd 1,800

www.kleemann.dk
-gain abt 4% (abt 10-14 hp)
-cost still to be advised


I did not include Brabus or similar others as the upgrades were mentioned as 'performance kits' - and guess that involved more than an ECU re-programming..


George

++

On an SL500 I wouldn't even waste money on the chip unless you REALLY want to.

You're not going to feel that major of a difference unless you start spending big bucks to go forced induction.

I got a chip on my X5 4.4i and yes the shift maps were changed it the car was a lot more responsive, but it wasn't worth the money I paid (I less than a thousand$ for it).

I agree with VRAA. Forced Induction would be nice but the cost is what kills you.

Do you know anyone who has done the Renntech or any other FI upgrade to the SL500?

Why would you still be interested in spending $1800.00 after reading that post. 10 h.p.?!!!