A B16 head is usually mentioned for being better for pressured induction as it has superior movement figures than the B18. On the other hand, a B18 head can be ported and polished to obtain comparable movement figures as 1 from the B16. both of those the B16A1 and B16A3 https://b16a222444.madmouseblog.com/10091387/b16-engine-and-transmission-for-sale-options