The premium version of the Arrow Thunder for the Honda CBR125R differs mainly optically from the standard version by the use of a massive steel end cap. As it is made of an aluminium shell like all Arrow silencers, the sound is similar to that of the other versions. With this Arrow Thunder you can expect an increase in performance of about 5-8%. To mount it you simply replace the OEM silencer with the Arrow. You do not need an additional manifold. The scope of delivery includes the rear silencer, the dB-Killer insert and a stainless steel retaining clip. Of course we deliver the Thunder with EG-type approval.