I have one of our supercharger kits come back into my possession.
Complete assembly including MP90 supercharger with around 10000 kms from brand new.
Is made for the serpentine belt DOHC 3.5 V6. Will also fit the 3.2 DOHC with some work to the drive belts
Low boost configuration kit, requires no changes to engine internals, factory engine management or fuel system. Lifts horsepower at the wheels by approx 30% - from 134 to 175, with a matching increase in mid-range torque.
Fuel consumption generally improves overall as less wellie is needed in day to day situations.
A competant DIY'er could be back on the road in less than one day.
These new sold for a shade over $5300 with the supercharger not including fitting costs.
$3800. Open to offers but dont be cheeky 
Rob