So I've been surfing the web and doin some research and I've narrowed it down between these 2. but i can't decide on weither to go with a stand alone fuel management or a piggy back system. anyone got any input?

SAFMS

Piggyback

Maybe this piggy back?

I'm leanin toward a piggyback but i'm not sure yet, and then i'm not sure on which piggyback to get!!!!

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2000 A4 FrontTrak
15% tint (legal.. no, Do i care...... no)
Steering Column Boost Guage
8000k HID's
Debadged
Really sqeaky Control Arms :/
Blistien Shocks/springs on the way