Very sharp car, where did your mom buy it at. I take it she payed sticker for it. Ive heard of dealers titling them, then putting some miles on them and selling them used for more then sticker.
No, it has the 2.4L ecotec (LE5) NOT the 2.2L ecotec (L61). You are right the hp is around 170. If it were the L61, then it would only have 140hp.
Also the cobalts (and Pontiac G5) have the L61 as the base motor, then the SS (G5 GT IIRC) has the LE5, and the SS s/c (G5 does not have this option) has the LSJ (205hp s/ced ecotec) which is similar to the LNF.
And then the G6, Ion and verious other cars use the LE5 as its base motor.
Specs are stated above. But there is also the Sky Redline (or Solstice GXP) with the 2.0L Turbo Ecotec making 260hp (LNF)