Stage 1 P5155175 Turbo Upgrade Kit, Stage 1, Caliber SRT4, Built Through January 15, 2008 P5155199 Turbo Upgrade Kit, Stage 1, Caliber SRT4, Built After January 15, 2008 Blow Off Valve P4510548 Blow-Off Valve Conversion Kit, Anodized Blue, 2003– 05 Neon SRT4, 2003–09 PT Turbo, 2008-09 Caliber SRT4 Sway Bar Kit P5155037 Anti-Sway Bar, Stage 1, 26mm Front, 24mm Rear, 3 Position Adjustable, 2008 Caliber SRT4 Strut Tower Brace P5155033 Strut Tower Brace, 2008 Caliber SRT4 Stage 3 Coilover Suspension Kit P5153838 Coilover Suspension Kit, Stage 3, 2008-09 Caliber SRT4 Track Suspension Cold Air Intake 77070008 Cold Air Intake System, 2008-09 Caliber SRT4 O.E. Performance Air Filter P5153987 Air Filter, High Flow, O. E. Replacement, 2007-09 Caliber SRT4 Cat Back Exhaust P5155071 Cat-Back Exhaust System, Single Rear Exit, 2008-09 Caliber SRT4