Isn't sportwerks horizon's new house brand? Any ideas who actually manufacturers them?

Since the storm is a bit on the heavy side I would look into a 14mm cranked engine like the current P5 and it's rather large crop of spin offs. Crono has an RS5 that is nothing more than a rebadged 14mm P5 with a heavy duty rod which can be had for around the same as an S7 II.