All b18 blocks (b18a's, b18b's, b18c's, maybe even the b20's) come from Honda with the same deck heights. So, the header should fit vertically. Horizontal fit (length of pipe after the first bend to the catalytic converter), however, will be off because of the chassis difference. See, the DA bottom half of the manifold will be longer than the DC bottom half. I hope that clears it up.