Peakier. The damping foam is there for a reason. The RE-00's frequency response has a slight upper mids bump, similar to Etymotic IEMs or the Ortofon e-Q8. This makes them sound very clear and intimate with (female) vocals, but also borderline shouty. That kind of sound signature requires a particularly smooth response to avoid sounding obtrusive. I wouldn't recommend to remove the foam entirely.
10/27/16 at 8:38pm