Hi, I am planning to swap the engine of my E34 (520i 1989 model manual shift) with a 525i 24-valve 1993-4 auto shift, sourced from Japan. I have been getting conflicting advice as to whether I should go for a Vanos version or not. The Vanos engine costs almost 70% more than the non-Vanos. Can anyone help me out? Thanks in advance.