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We didn't see the need to do 4 inch in a forced induction setup. Everything else is 3 inch and honestly the 3 inch setups we've run such as our 8 second FWD Grand Prix with a 231 ci 6 cylinder or on our INTENSE G8 TT GT make upwards to 900 horsepower. We use a G8 GT MAF Sensor so that necessitated the rise to 4 inch as that point. In a naturally aspirated setup the extra inch would make a difference but in this application no.
As for the blow through setup we've done it both ways before. In particular this setup has dual intakes for the twin turbos so if we put the MAF before the turbos in a draw through scenario we would have had to find a way to get them into one intake or use two different MAF sensors which is messy business.
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