Most gen4 5-speeds with intake/y-pipe/exhaust should have a 14.5~14.9 potential. I don't think any currently available header for the VQ30DE in the gen4 makes any more power than the currently available y-pipes from Warpspeed/Cattman/Budget.
(although if there's a new header out there, other than the crappy one from that New Zealand company, I'd love to hear about it!)
Being a monkey though, I doubt I could drive a quarter mile run that fast.
