I use both an unmodded 6025 and a sureflow 1600 on a maxi 900 in my 42 hex. Both are nice products IMO. The maxi mod definitely puts out more flow than the 6025. I would say >1000gph. However it is more unsightly than the tunze. I haven't had any problems (knock on wood) with the clips on the tunze. Mounting the maximod is a bit of a pain and not as flexible as the tunze. Of course you can get the magnet option with sureflow (or DIY), but then the costs jumps quite a bit.
IMO you can't go wrong with either one.
Try one of each and go from there if you develop a liking for one over the other. You won't have any trouble selling them locally or on RC, they both hold their value quite well.
GL
Garrett.
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