For the Performance Package, there's also 37 lb ft more torque, albeit spread across a marginally
narrower rev range.
Not exact matches
The very short answer to the final question is that short, wide inlet runners move the torque curve up the
rev range whereas long,
narrow runners move the curve down the
rev range.
Its speed
range is quite
narrow and it never
revs hard, but the effect is to make the Ampera feel surprisingly normal in a CVT sort of way.