bigger turbo on a smaller stroke engine (77mm ersus the gsr 87 and the ls's 89) would make the turbo spool even later causing him to have a useless powerband. i had a 3 mill hks headgasket on my stock b16 and it drops u to 8.5:1 and it kinda sucked when not in boost.

but yeah, i forgot about the 255 pump. he said the car was boosted b4 so it should have one already.