Not going to read all 10 pages of comments on my this bs but the $300 OBD exhaust valve controller is best investment ever. And should be every owners 1st mod. 94.3% of owners don't know that in efficiency (not comfort) the valve opens under heavy pressure load and in sport+ the valve is closed until high rpm. The permanent open setting on controller changes your life. You can open valve and then disconnect connection to car like some cheap asses do but when your cold start and want to be respectable or see a cop, it's nice to have a 1 second silencer.
Please let me know if you are following this post and someone has already touched on this subject because surprisingly I haven't met a single enthusiast who knows how stock exhaust valve controls work.
