theirs a 50/50 chance imma get the RRM tubular manifold with a 16G turbo. i know the 02 housing is seperate like an extra 150. someone charged me custom piping for about 500 dollars. does the 02 housing usually include in the custom piping?

 

You don't need a whole housing just for the O2 sensor... You can add a bung anywhere along the exhust piping you what.

BTW, get another shop! $500 for exhaust piping is too steep! Got 2.5" done on my Civic for $180...