Neither of those will work if you want my Honest opinion.
The Maximizer only has one o2 port which means youll have to drill and weld on a o2 port somewhere in there. I would only use F2 headers if you can find it. Or Fswerks. Its expensive but the HP gains are higher with properly made Headers.
2012 Audi Q7 TDI S Line ABTuning 391whp588wtq
01 Turbo Focus 300+ whp
2012 Focus 19" Niches, AEM CAI, F2 Race Header, 3" Borla Dual Exit, H&Rs, Eibach Sways 183whp157wtq