Then all the commo's have to do is change the diff to a 3.69 or 3.89 and you won't be sticking with anything.
14's aren't a hard thing to get, mate of mine has a supra thats doing 14.7 with a bit of work and my 300zx is doing 14.5. The thing i've noticed with commodores is they take off fairly quickly(with a shorter diff, like 3.89 or so) but lack a fair bit up top, even the new SIDI VE SV6 isn't that quick.