With a stock air box, My dealer installed 45 pilots and that was it. They will bark when you get on it. The tone is not super deep like BUBs, but not as thin as say drag pipes. I've had them, they run well, but be ready to repack them fairly soon (which is to be expected with any re-packable baffle system).
If you dig the inverted cone look, they are quite good pipes. Very well engineered and quality on mine was very good.
Here is a pic of them on mine when it was just delivered:
