Not quite sure how old they are. Just bought the car this past summer.
2007 Pontiac Grand Prix GXP - ZZP exhaust,1999 Pontiac Grand Prix GT -Falken Cinturato 828 tires,GMPP performance handling kit,oversized front sway bar, front strut tower brace, tubular trailing arms, spectre cold air, 180* drilled thermostat, ZZP Racing transmission with 3.29 gears, 4th gear hardened shaft, shortened dog bones.