are the GXP's faster than the GTP's?
According to C&D:
GTP 0-60: 6.6 sec. 1/4 mile 15.0 sec @93MPH
GXP 0-60: 5.7 sec. 1/4 mile 14.3 sec @98MPH
You can read their road test of the GXP at:
http://www.caranddriver.com/roadtests/9964/pontiac-grand-prix-gxp.html
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