I’m curious how these Bimmertech subs sound.. do they go pretty deep or are they more like a mid bass?

I have the BavSound kit installed in my Logic 7 E90.. very big difference. I did try their under seat subwoofers when they first came out and returned them.. I wasn’t happy with them, certain frequencies missing, so I’m running the stock ones with the upgraded speakers and tweeters.. it sounds great, but I’m curious how these Bimmertech subs sound.. do they go pretty deep or are they more like a mid bass?