Look up the dcs6 pipe thread by Mitch. That's probably the power delivery your looking for since the dcs4 is more mid range.

Spark arresters required in Germany? DCS silencers has one, but the HPR silencer doesn't.

Sound limits in Germany? Both silencers do the job of quieting down the noise, but I'd bet both would have trouble passing a sound test required in some riding areas in so cal.