I have to say that the different shifting pattern it has now, due to the JDM tune, also helps, the car doesn't shift to early but keeps a little RPM's and this has little to no drone except when it goes in OD at lower speeds.
So now I am installing my 2 LPG tanks (total165 liter) to have the car run on LPG(Propane mix) and after that is done I will see how it sounds.
I love the idea of running on LPG for only $ 2,60
a gallon instead of almost $ 7.50 for a gallon gas
If it still has the drone, i will start with inserting and tack welding these pcs of pipe in the muffler.
Hennie