Just thought I'd throw this out there. The M62 doesnt really become massively inneficient until you go past 1 bar. Whats unique on our cars is the fact that it is intercooled which is really rare for a supercharged setup. When you look at the M62 map it is still 60-62% efficient at 1 bar and thats without an intercooler so increase that by even 10% and youre at 70-72%. Idk why everyone suggest the m92 or any other roots charger, they are not nearly as efficient as the M62 we have already... Just didnt want you to think its just a hot air pump, maybe an intercooler with low psi drop and smoother piping would be best eventually