DistoCore

Perhaps the best plugin I have found for its purpose. Crushes kick and bass sounds in every regard.

Awesome distortion for making extreme kickdrums. I use it mainly for creating Hardcore kicks and it is working great, the additional filter effects make a great variety of sounds possible and it is working well in FL Studio. I would recommend this plug-in, free and the pro variant.

I also had a small problem, and within 3 hours I got answer by facebook, solving my problem.

The best way of creating great sounding kickdrums in going really low with your original sample and then make this plug-in do his job.