I love the Borlas. I don't have a resonator so it is loud and I get a slight drone @2500 RPMS. The Idle is mean sounding and when WOT the charger is screamin alot louder. As far as boost goes I'm going by the DIC. Seems like it is showing boost more now than before (could be that I can't keep foot out of it) Idk lol. And I thought something was wrong with the engine then realized the Wizair is alot louder too. All in all it was a great improvement overall.