| i believe your motor is a m20 and not an M50. Im doing an M50 swap into my 90 525 right now...but if that isnt an option you can look at E30tech.com and they have alot of DIY roots blowers with pictures on the forced induction-supercharger section. Turbo would seem easier but more expensive...but the best mod you could do is upgrade to a DOHC motor. |