Thanks for the responses, I figured they would be junk but I wasn't sure, I also figured there would be a few others wanting to know the same thing.
I've been thinking about a cold air intake, or at the very least a K&N filter (with extra holes in the air box??) but I'm not quite sure yet besides I'm about to spend big money on a camera lens for my other expensive hobby so I'm sure it can wait a while.  The extra power is more needed if/when I put on bigger tyres.
I've got 2.0L 4 cyl, 4 door and it drive fine unless you want to push it and the biggest things you notice it the lack of torque at low revs.
Anyway I'm just doing lots of research so I can start to plan what I might get done, how things will fit together and to kill some time at work  :oÂÂ