can some1 gv idea on how to put neon under my case so that it would look like the fast and furious car.. =p

well cut a few extended holes in the bottem of your hopefully suspended on feet tower with some reflective coating on one side of your neons i think would work somewhat well.
only way to know for sure would to google for what other people have done

What case do you have?

I would suggest tape... or glue... maybe velcro. Of course, this will only work if your case has feet or castors.

it reminds me of some of the xbox case mods i have done check out http://www.x-scene.com/xbox-tutorials.php?p=191|254|#234
for some tuts i found

You could mount it inside the case, cutting a long hole in the bottom and filling it with transparent plastic so it lights both inside and out.

You might also want to investigate lighted case feet like these. I know that Sunbeam also makes lighted case feet.

I agree with both of these. A reflector such as a flat aluminum sheet or even a mirror would work quite well and definitly amplify the effect. The bottom of the case being partial glass or even replace with a glass panel would be much safer and easier to mod though. What kind of case are you working with? Pics would be nice too .

how-to firky?

well it was realy easy just made 4 piles of 2 pence pices till i could rias the case high enough to stick a neon to the under side of my case then blue tacked the coins so they didnt slide or move lol cost me 32p lol

lol