Kronodeus

I noticed my local M-B dealership offers "performance tuning" options which include things like upgrading ECU and enhancing exhaust sound. I was considering both of these and looking at third-party options, but would much rather go with M-B's offerings if they're good. The dealership's website mentions exhaust sound options with names like "earthquake" and "daytona" but I am not sure if they are actually modifying the exhaust system or just tweaking the sound enhancement algorithms that kick in with S and S+ modes. The ECU upgrade also sounds very enticing since that is the first real performance upgrade I was thinking about doing.

Anyone tried any of these offerings from M-B on your GLC? Is it worth it or should I just go for something simple and aftermarket like a resonator delete for the exhaust or third-party ECU chip?

Here is the performance tuning page from my local dealership's website: https://www.mbsd.com/mercesdez-benz-performace-tuning/

glassbloke

If the ECU is done by the dealer, I would expect it to be covered by the MB warranty.

Sugar_Mouth

I would not expect MB to warrant any ECU tune related failure even if the dealer installed the tune.

Kronodeus

That's a scary thought! Surely the dealership would warn me that I'm putting my warranty at risk? Have you experienced or witnessed anything that would make you expect that?

Sugar_Mouth

The terms of your warranty do not get updated by MB because a dealer installs a tune vs any other tuner. The dealer can say "oh don't worry we will take care of you" but I would want that in writing and in detail because I know MB will not be covering it. Count on any ECU flash outside approved MB software to create an issue if your turbo fails from a tune for example.

Anyone who wants to rewrite the ECU or TCU should be ready to cover failure that can be related to the modification.