Can anyone think of potential issues if I lengthen the throttle body rubber boots between the TB and the heads?
Exactly what I was thinking - hence my wondering and slight concern.Unpredictable. Rule of thumb says your curve will move "down RPM", that is, it will get fatter at a lower RPM. However, there are too many factors in tuned intakes to say that's what will happen. You could lose torque all across the range, it could bump up just a tad, who knows?