gan.. mau tanya nih apa sih beda dari masing2 knalpot di bawah: R9 Racing Generation Mugello Full System-Silencer Half Blue, Kawasaki Ninja 250 R 2.100.000 R9 Racing Generation Mugello New Full System-Silencer Half Blue, Kawasaki Ninja 250 R 3.800.000 R9 Racing Generation Mugello New Full System-...