i have the simota cf intake.
if you want that deep sound from the engine then simota is just the thing for you. its gains are about 1hp. not much but ehh. as for the gruppe m i heard thers a +5 hp. plus i like the way the gruppe m is placed in the engine.
i too want to invest in that product. but i dont know where to get one.
ne who simota is a lot cheaper.
good luck with the decision.