I expect Katoum is referencing the OEM (sparky equiped) 625 SXC silencer which is more expensive, rather then the non-sparky equiped Hard Parts SXC aftermarket silencer.
I would suggest you get the one of these two, depending on your need for a Spark arrestor, as the SXC Supermoto is a tad loud, but would be fine for an SMC or something similar used on the street. (For those that already have these silencers on their 625's, IMHO there is no real advantage in the Hard Parts silencers over these OEM SXC silencers, at least not enough IMO to warrant the expense.)
Österreichische Motorräder und deutsche Autos. Wie wundervoll kann das Leben sein