Stu,
There isn't any easy bolt on part that will do anything to make any noticeable improvement.
There are a few easy bolt on parts that will hurt your performance.
The Vipair will not help or hurt you and it doesn't make any difference what kind of facia cooling duct you have.
If you like the looks of the Vipair or smooth tubes or big plug wires or cold plugs or silicon hoses... Go get some.
They aren't going to make any difference. They are just silly bolt on doo-dads. Don't think of them as mods.