A reason for lack of power ???

[Robh18]

The other week i posted a topic on here about my trophy not feeling the same as it normally does and a little sluggish. It only became apparent to me the other day that....
4 weeks ago i fitted some HID's, it was straight after this that i noticed the lack in performance. So i had a look tonight to see if i had knocked anything whilst i was fitting them. I could not see anything wrong. However, i noticed that i had placed the ballast for the nearside headlamp right near (not covering) one of the air-box inlets. I know its probably very unlikely but would this ballast pack restrict air flow in this area to the air-box inlet ?
please help, or if you know of anything else to look for please say.
Thanks guys

 

[Robh18]

oh just another few things to add... it seams to be a little louder when i accelerate hard and just not feel as fast.
At idle it is now much more lumpy than usual.
It had its major service 4 months ago and has covered 1200miles since then
Past its M.O.T last week with emissions being all OK so not running to rich
And last of all, unless a coincidence this lack of power seems to have arisen from me fitting the HID's (front bumper was removed to do this)
*only ever run on V-Power
*Could it just be a bad batch of fuel ??
Cheers Guys.