Best way to cut a hole in a steel deep valence, and not destroying the paint. Options

[Aaron Cox]

long story -

i had a triad dual out exhaust, and i scored an early deep valence.
i had the hole welded up, and was going to have to cut 2 other outlets anyway.....

so now i have a eurorace single out header. guess what, it goes out about where the old hole used to be....

so how do i cut the hole and not fubar the paint?

masking tape? Jigsaw? Dremel spiral saw? plasma (joke?)? 3.5" holesaw?

maybe i can make a nice "trim ring" for the porthole exhaust, kinda like what you see on boats and mustangs where the exhaust goes thru a "porthole"

ideas?

anyone wanna help by GAF next weekend? LOL


EDIT: here is what look like an easy way to cover up a not so stellar hole cut.....
now, can anyone make one for me? LOL
(IMG:http://www.classicmuscle.net/1965%20Ford%20Mustang%20Red/rear.jpg)

[Lou W]

Try an electrical die (male and female) They work slicker than hell and are used for punching holes in electrical panels for conduit. I used them to punch the holes for my oil tank. Any electrician will have a set. You might still chip a little paint though but I think it would be the cleanest way. Make sure they are sharp and not worn out.

I would think that the hole punch would work fine if the metal is flat, I can't remember if the rear was curved or not, if it's curved, it might crease the metal and cause the paint to crack.
I'd probably cut it first with a pnuematic saw such as this, I've used one on my car and it cuts real nice, then clean it up with a dremel.