Hi,
It is actually an easy installation aft watching my mechanic friend
did it for me. If you get it from the shop I believe they charge
you for installation as well. Anyway there are a number of shops in
the Alexandra area, i.e. opposite Queensway shopping centre that
carries cyclone 2.
Improvement varies 10% to 25% (Claimed by manufacturer) but my
improvment is only 10%, also depends on your driving habit, light
footed or heavy footed.
btw im not using cyclone, but got it sent from USA, check out the
site
http://www.vortexvalve.com