Can I use HFS-2 instead of HFS-3 for my 335i setup ?

[cstavaru]

Hello,

I want to install an Aquamist kit on my BMW 335i, which will be flashed with GIAC Stage 2 and Stage 2 Race maps (switchable). The Stage 2 map is designed for 91 octane US-spec (or 95 EU-spec) and the Stage 2 Race map is designed for race gas or 91 + meth. The Stage 2 Race map also has a "submap" for 93 octane (US-spec) or 98 (EU-spec) which is activated by the ECU based on the fuel quality.

I have to make a choice between HFS-2 and HFS-3. My question is, how important is a failsafe for my setup ? The GIAC flashes don't have a failsafe system so my only use of a failsafe would be to let go of the throttle if a problem is reported by the meth kit's failsafe system. If I always use at least 93 octane gas, will I need to worry about not having a failsafe ?

So what do you think ? Should I spend the additional money on the HFS-3 ? Right now I'm leaning towards the HFS-2...