Coil on plug ignition really. The seller really shouldn't call it "Direct Injection" as in the Mazdaspeed3 and Mazdaspeed6's DISI powerplant or the 2.0T FSI's from VW. I'd consider this if I had a 1.6 and my coil crapped out on me.
Hey guys I have had these on my 99 NB for a while now. I bought them @ Rspeed a couple years ago. They work great, but trust me no way in hell are you going to get 10 hp out of them. They also look good. But they were high as hell when I bought them. You pay for what you get. 8)..............Nopro, wide, (NB)