If the electronics on your W140 didn't scare you away then the W210 shouldn't either.

The OM606.962 ECU can be re-flashed. Lots of tuners around. Typically advertise 10-20% HP gains for ~$2-300.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)