im finishing my 2.0 ls-vtec build and im trying to decide which header would be best. the build is a b18a sleeved block bored to 84mm. p30 pistons. b16 head. blox type b cams with valvetrain. and havent decided between a victor x intake mani or a blox. but ive narrowed my choices for the header down to either the smsp b20vtec header or a the anr street header/rmf copy. which would be best?

 

The headers need to match the intake, cams, compression and head, once you figure that out, with the RPM's you are going to be using all the time then decide on headers.