EVOTECH | Introductory Pricing on W211 E500, E320 ECU UPGRADE
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Eurocharged 2004 E500, Eurocharged ECU/TCU 2005 SL600, 2010 Caddy SwaggerWagon
I'm not sure what the gains are on the 350, but I'd guess about 15hp/15tq. Expect prices between 700.00 to 1500.00 range, depending on tuner. Just not sure if the gains are worth it on your car, but that's a decision you have to make.
Good luck.