I just did this, and performed a very rough A/B test with one earpiece modded, while leaving the foam on the other. The bass (on a bass-heavy song) was very no

I just did this, and performed a very rough A/B test with one earpiece modded, while leaving the foam on the other. The bass (on a bass-heavy song) was very noticeably more muted on the stock earpiece, sounding almost completely dead compared to the one without the foam. Needless to say, I quickly removed the other, and now they sound better than ever. Highly recommended!