The Q45 maf is close to 4inches. The inlet side of a lot of turbos out there are 4". I see a lot of setups with the MAF on the uncharged side run like this: air filter, MAF, then reducer inlet side of turbo. With the E-manage Ultimate, we should be able to make this work, right? Would it be worth it? Would a straight through 4" intake piping diameter be beneficial compared to a 3" that goes to a 4" turbo inlet via a reducer coupling? (well, not reducing though, since its backwards it expands the 3" piping to fit over the 4" mouth of the turbo inlet). So I guess i'm asking 2 questions. DOes the size of the piping on the turbo inlet make a big performance difference between 3" and 4"? Secondly, any pros and cons to running the Q45 maf over the Z32? I'm talking about setups with the maf on the uncharged side before the turbo.

 

I am pretty sure the Z32 can read more air flow even though the Q45 might be larger in size. If you are going to run EMU then you had might as well run a MAP sensor conversion instead of bothering to swap MAFs.

 

Pointless in my opinion, for the reason spig said and also this - the outlet on a T04S compressor (the compressor style that has a 4" inlet) is 2.5", so you'd gain nothing going with a larger front side (before the turbo). Furthermore, the compressors with 3" inlet and 2" outlets are still capable of flowing upwards of 600hp. No need to bother with added complication unless you have one easily available and it actually makes things easier for you. But you won't "gain" anything with it.

I don't know anything about the actual airflow metering capacities of the Q45 MAF.