I do Manta, their 3" quiet system doesn't drone. I have 2 orders outstanding at the moment since late October but not because of Manta, both systems include ceramic coated headers and the backlog by Hurricane then closing over Christmas made things worse. They are on their way now so hopefully I will dispatch both orders this week.
I have been speaking to a guy in Melbourne with a VF that drones quite badly with a KPM. He has changed from a Difillipo to another brand, can't remember what it was, then to KPM. Still the same issue because nobody told him that a cam makes the exhaust raspy and drony if you don't have a front muffler. He is thinking about getting the Manta mid section then modifying it to suit.
I can do Manta at a really good price.
