d15b is SOHC, all B-series is DOHC.....SOHC more for fuel economy, DOHC has more performance...dont waste money on D15, straight go to B16 or B18....or K20 is even better...DuKe said:getting a hatchback dy.....anyways anyonw knows wuts da diff wif D15b wif da other vtech engine's...?? b16a...b16b...sry la..i damn noob at dizz...wanna learn more