b16 its really fun in the DA chassis, and it gives you alot more options because its good for all motor and its also good for boost. b20 meh its good as a replacement for a daily, but you would need to resleeve or use a block guard to have any FI fun and if i was going to seriously consider the b20 i would just get a b18a/b and lsvtec it bc it gives more options.