I myself use the Monster Rides long tube headers, seriously they are good and Matt provides the good service.
Drone, the first answer to droning is to always get a decent muffler in up the front just after the Y piece, you need to reduce noise right there then add another decent muffler back behind that a bit, after that you can nearly remain straight through.
With V6 engines or small capacity H6 engines, you need get some muffling happening nearest the front as reasonably possible.
If the exhaust system further frustrates you or what I have written doesn't seem right, then purchase an entire Monster Rides V6 Hilux exhaust system, it is drone free entirely, fantastic system. Good note too.
Hilux V6 4.0 - 2006 with Supercharger. 256rwkw/320kw engine - 575Nm Torque