Fitted. Fairly straightforward as my local specialist had a tool to crank off the old pulley. Start to finish, less than 2 hrs with breaks and my limited ability
First reactions? Took it down the road and on to a Motorway and planted my right foot. Initial reaction...wasn't impressed. Didn't get the 'fizzy' quick response I was expecting...but then looked at speedo: 120!! OMG!
The net result is a smoother quicker car and it's definitely noticeable, so as a bang-for-buck upgrade, I'm very pleased.
I'm concerned with noise levels because I track my car, so this, a smoother air intake tract and a custom re-flash will be all I'll be doing from a power perspective.
Get one!