【ハーレーダビッドソン】FP4でチューニング！！ その効果とは…！？ とにかく…スゲーぜ！！　　＃ハーレー＃チューニング＃fp4

Thank you for watching. This time... following on from last time, it's another video about mufflers!! Since I went to the trouble of replacing the muffler with a full exhaust type... I decided to do some tuning!! The device I used is... Vance & Hines [FP4] It's a very easy tuning method that can be done using a smartphone app... but what are the effects...!? I hope you'll watch until the end.