RoarkDunn

Would like input or suggestions for reasonably do-able handling upgrades to my 2020 C300.

While we're at it, will be needing to replace run-flat P7's soon: Considering going to regular tires and buying a doughnut + jack. Thoughts or suggestions?

PaulR7

Going from standard suspension to Eibach lowering springs has really helped my car in terms of handling and road feel.
It's right up there with getting a proper summer performance tyres, I went with Michelin Pilot Sport 4 which were absolutely great (although did wear very fast, might be partially my fault running them a bit deflated) and now running Pirelli P Zero Nero GT which are very comparable.

RoarkDunn

Hi Paul, good intel. Is this on a C300? How much is the drop? What sized wheels?

PaulR7

No, that's on a C220 (tuned but a small 2.1 diesel nonetheless) on 17" wheels. The drop is very noticeable, got some really rushed pictures in https://mbworld.org/forums/c-class-w...g-springs.html

RoarkDunn

I like it. About how much to buy / install? I'd have to research my C300's 18" wheels fitting.

PaulR7

The springs cost me £180 and I fitted them myself with help from a friend with spring clamps so the total cost was £220 including the bottle of whisky
They should fit just fine on 18s, I'm sure I've seen those springs used on 19s although admittedly with very low profile tyres.

RoarkDunn

I'll check it out. Didn't realize you were UK!

dagger22

Most would just change to lowering springs, some would go for coilovers. Really boils down to your preference and need for adjustments (height, damping adjustments).
Some have also added stiffening bars, although I personally do not think it's needed unless you track.

Most do get rid of RFTs and a lot would prefer the PS4/PS4S tyres.

RoarkDunn

Thanks Dagger22.

What is commonly accepted knowledge regarding ride trade-offs of springs versus coilovers?
Hadn't though about having adjustabilty, but should I?
Do I assume these will all void warranty?