RoarkDunn

Enjoying my new '21 C300 4matic, about as much as my '20 C300 4matic that drowned in Hurricane Ida.
Car came with AMG package and the 18" 5-spoke wheels, which I replaced with the AMG 14-spoke 19" and Continental ExtremeContact Plus XL.
Enjoying the ride and slightly improved handling.

Here's my question: What can an owner do to improve performance and handling without jeopardizing the warranty?
Pretty sure the answer is nothing, but want to put it out here to you folks to see if there's anything I'm unaware of.

Historically, I've bought used or even vintage cars that I could lower, upgrade shocks & springs, change exhaust, etc.
I want to tweak but I want to be 100% sure I don't void coverage!

CClassfan1

I believe Renntech has a chip tuning upgrade that plugs into the ICU that adds another 54hp or something along those lines. I think it's $2400 roughly speaking. I don't believe it will avoid your warranty and you can quickly pug and unplug it.. I have not used it but it's a possibility for you. Here's a link if you're interested...https://www.renntechmercedes.com/ind...-present/c-300

Andy74

Its risky: your giving the dealer an excuse to void the warranty. I am out of warranty. What I have done gave me better performance more torque. But the car is running, thank God, without any issues at all. You can't even talk to your dealer about it because if you do once you bring it for maintenance they will start digging for performance alternations like ecu remap exhaust system upgrade ect... I really can't think of anything that you can just hide or make as if it never existed. Dealers these days can know anything specialy when playing with the ECU which is a major part of any performance upgrade. If my car was under warranty my dealer would refuse to fix anything under the warranty.

1- Armytrix Valvetronic Exhaust system with its downpipe.
​​​​​​2- Brabus Power Box
3- K&N air filter
4- Racechip Pedal Box Here is how it sounds like. Its a 2015 C200 AMG line.

RoarkDunn

Pretty sweet, Andy.
I know they can tell if a chip has been installed and removed.
My question is whether or not there are any options that manufacturer will not disallow.

Andy74

How is your relationship with your dealer advisor. Is he friendly can we have a chat with him about the subject matter.

Elvisfan0108

I would bet that anything not installed by the dealer could effect the warranty. The dealer may have a tune that they can do. I once has a tune put on my Volvo. Dealer installed. No problems.

Andy74

Good idea why not involve the dealer to eliminate the risk of voiding the warranty.

JRC1979

What size Conti's did you end up going with? Did you stick with OEM width or did you go up 10-20mm's in width? Thanks!!!

RoarkDunn

I chickened out and did the OEM for this wheel.
Same specs as C43.