I think 100rwhp is about right between an LS1 @ GT. My friends 2000 GT with CAI @ Catback only put down 232 rwhp. My other friends 2000 SS with Lid @ Loudmouth ran out 334 rwhp @ 339rwtq on the same day. For a GT to be able to outpower a stock LS1 from a roll race it needs FI or Internal Work, IE ported heads, cams, etc. There's guy that posts on LS1.com with the above mods, heads, cams, longtubes etc that makes around 290-300rwhp NA and he has a hard time with stock and lightly modded LS1's. If were talking about track races thats another story as a car with less power but better traction and shifting can outrun a more powerful car with less traction.