Maybe I missed it, but what is the vehicle?
If you are driving something with twin turbos (///M) those are most likely the water to air intercoolers.

They are used to cool the intake air (air is heated when compressed by the turbos) before it is fed into the engine.

Just a thought,
95wildtt

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2008 4.8i X5 (2/25/08) 105k:
Titanium Silver/Black; All -HUD; Aero Kit; 22" VS-130 w/Pirellis;
///M Shifter & Fr Brakes; Gauge Rings; Console Pads; Custom Wheel & Mats; Roof Rails
Carbon Fiber: Int Trim, Nav Surround, Grill, Cluster Trim, Shifter & Eyelids
1.2" H&R; LUX AEs; LCI Tails; Rear Fogs; NBT EVO; ESS Tune; Meisterchaft GTC Exhaust