Cobb AP question- Stage2+SF 91?
So, I've purchased a Cobb AP and will be getting it tomorrow, and over the past several days have been searching and reading the forums to learn as much as I can about it (and about the MS6 in general), and to be sure I'm loading the proper map... but can't find an exact match. I think I'm stuck. Does anyone have advice? Or if I've missed a thread that nails my situation, please point me to it (though I think I've been pretty thorough?!)
Relevant mods are: 1) Cobb SF intake, 2) cp-e 3" downpipe (still stock cat-back. I've also put in the Iridium step-colder plugs and and Cobb TIP, though that shouldn't affect the map decision).
Only octane available is 92 at BP. So I have to disregard the 93 octane maps.
From these mods and what I've read on Cobb's site, I should be looking for a map description of: Stage2+SF 91. Unfortunately, there's not one available on Cobb's site. I've also checked Mzdspd.com, and the closest I could find there was Stage2 91 (but no Cobb SF intake noted).
So then... any advice on the map selection? Is Stage2 91 (without the SF notation) what I should use? They also have Stage2+SF 91 +FMIC... but then I'd have to break down and buy a FMIC.. which is tempting of course, but costly. I could always pony up the $175 for a custom e-tune from Christian at Cobb... but would like to use something out there if it's already available. Also, ATR is not currently an option for me since I'm not a tuner (though would like to learn more).
As a final question, does Stage 2 absolutely require a cat-back exhaust, or is the 3" downpipe+stock cat-back sufficient? I believe I've read that the catback is not necessary but will produce more gains over stock, though I'm not positive on that.
Thanks for any insight (or links to other threads here) anyone can provide!