With this GRT stage 1 kit, the original airbox snorkel is eliminated which creates a reduction in air flow. Torque and power increase considerably as you can see from the attached dyno graph. Available also with filter P08 or T12 (Stage 2) here:
Filter Tuareg 660 Aprilia kit stage 2 by GRT – www.mbspecialparts.co.uk
and here:
Kit stage 2 for Aprilia Tuareg 660 by GRT (Sprint Filter SM240S) – www.mbspecialparts.co.uk