Ive done that mod and it looks closest to option 9 but not 100% sure on it @[deleted] is kind of good with part numbers tho and prob the man to speak to. That said i recently drove an astra g WITHOUT its intake pipe so air went straight into the air box - and i thought that was actually a good improvement on the standard set up but its been a while since ive owned one and couldnt do a back to back comparison of with pipe and without.