About my Grand Prix
I have an 08 GXP. It came stock with 303hp & 323tq. Since purchased I have added a K&N cold air intake,Magnaflow cat back exhaust,& Vector motorsports ecm/tcm tune. My next mods include an Airaid throttle body spacer-Jet powerflow air sensor & MSD coil packs. After warranty mods will include cam & rocker arm swaps.