I would say no cons at all. In a nutshell, it turns the OEM intake into a poor mans cold air intake.Do you know what the Resonate Delete mod actually does? Are there any cons to it ?
Thanks dudeWhat TBass said. I would recommend putting some mesh where the baffle used to be to keep it from sucking in anything large. The only cons that I've heard is it doesn't actually improve performance because the exhaust can't keep up with the increased air intake. But it does make it sound cooler lol. I haven't had a chance to do it yet because I'm taking the X into the dealer this weekend for a timing belt change and I don't want them messing with it. But it's super easy. Should take less than an hour.
There's more info in the write up thread.