To make the noise Harley without going through the Stage 1 or change its line or its silencers, we can depast the pots. This amounts to going to pierce the pellet with a drill and a long wick or for my part to hit and pierce the pellet with a concrete iron (10 mm). This allows you to release the beast and instantly make your pilot smile Downstairs it does not change much, as we open: it's the big fiesta. On models equipped with a catalyst, be careful not to damage the honeycomb. My method in video