If the LS1GTO.com folks are to be believed, then here is a sampling of their fastest stock 2004 GTO's:
Top NA ET's - Stock:
1) ls1gto 13.10 @ 107.3 MPH
2) TRU GTO 13.136 @ 105.76 MPH
3) GTwhoa 13.15 @ 105.35 MPH
4) nutiger 13.245 @ 104.86 MPH
5) GTONEWB 13.248 105.99 MPH
6) slammin86 13.27 @ 105.46 MPH
7) Nmbr1GMfan 13.390 @ 104.54 MPH
8) nikivee 13.3 @ 104.00 MPH
9) 1meangoat 13.307 @ 104.61 MPH
10) win98nogood 13.393 @ 105.10 MPH
And here is a sampling of their fastest stock 2005/06 GTO's:
Top NA LS2 ET's - Stock:
1)NYTIGER 12.920 @ 109.40 MPH
2) BlackSheep 12.98 @ 108 MPH
3) KYGTO 13.035 @ 108.96 MPH
4) Judgethis05 13.036 @ 108.72
5) hookmechanic 13.074 @ 106.76 MPH
6) SloNlo 13.086 @ 108.75 MPH
7) TheCamel 13.112 @ 108.49 MPH
8) BadGTO 13.14 @ 104.99 MPH
9) Lord Vador 13.132 @ 108.85 MPH
10) steelerguy 13.378 @ 106.54 MPH
It seems safe to assume that stock only refers to the engine
.
A quick perusal of their drag racing forum suggests that most stock 2004's on street tires with a competent driver can break into the 13's easily enough, and 2005's are pretty easily mid-13 cars.
But probably not at Portland International Raceway
. There is a lot to be said for a good track.
Dave