ls6 intake???
I've normally heard that every 20 hp drops your ET around .1 second.
However, I've seen guys that added just LTs and an ORY and picked up .2-.3. Depends on how well you can launch and how well the track is prepped too. I'd say you'd probably drop .2-.3 with those mods.
https://ls1tech.com/forums/new-ls1-owners-newbie-tech/516260-how-fast.html

