LOL, just, no.
$10k in mods to a 99/01 will not net you $20k 03/04 Cobra results.
You cannot get a built motor, power adder, T56 and a whole gamut of other differences for $10k. Sure you can throw on a vortech or something for a tune of $4-5k when all is said and done, but you still dont have a built motor or tranny to hold it past that.
Ditto, all these guys that think they can take an 99/01 and build it to be a terminator for less are crazy.
I think an eaton swap is about 3500 with no built motor and you're limited to 450 rwhp. If you do a built motor and aftermarket blower you're looking at 10k right there, no transmission, no fuel system etc.
As for the fuel system a BAP on an 03/04 will get you 600rwhp no problem.
I would go for the Mach 1, better interior, solid rear axle, shaker, better heads/cams.