Forget the fuel pump, CAI, and boost solenoid, you might as well cellotape some fully sick cardboard side skirts to your car and grab some mean as hub caps from Repco as they will be about as useful.

I've heard pretty good things about the Ultrex System, but to be honest when it comes to exhausts you don't skint as you and everybody else has to listen to that shit FOREVER. Also, budget in a decent tune.. I personally went with a Verso Tune but up to you.

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2016 Levorg GT-S
Old man spec.