I really did not think they did much over the bigport and smallport? i had a S/T 20v at the time that hated daily life when it was disconnected.. Re: ITB Conversion on sixteen valve 4AGE the blacktops ran MAP sensors so there needs to be a way of getting https://miloilljg.thenerdsblog.com/37015513/5-easy-facts-about-4age-engine-for-sale-described