Join Date: Jan 2017
Vehicle: '02 SLK32 AMG
Other Toys: '05 SL65 AMG, '98 E320 4Matic Estate
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A tune, while not absolutely required, is still a really good idea when it comes to S/C or crank pulley upgrades. Not only does it get your AFR to a safe place, but you'll actually gain a good amount of power across the entire spectrum. Eurocharged is a good place to get a tune from, and I'd also recommend their TCU tune at the same time. Tuning the engine ECU alone will affect how the transmission shifts, so the TCU tune irons all of this out.
I will say this- you can drive it for a bit without the tunes as long as you don't floor it every chance you get. I'd almost recommend waiting a bit and getting used to how it drives, so that way when you do get the tunes sorted you'll be able to feel what a big difference they make.