The bigger TB and improved flow plenums help the motor breath at the higher rpms increasing HP but reduce low end torque. Yes, there was a noticable increase above 4000 rpm and no SOTP change down low with the 70mm. The 75mm TB will have a marginally bigger impact at both ends. More HP up top but even less torque down low. That's why most recommend the 70mm if you're going to stay NA but 75mm if there's a blower is in your future. Yeah, Yeah, I know, the sig says KB blower. Obviously, I didn't see the blower setting there waiting for me when I bought the TB.... oh well.
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