What modifications do I need for Stage 1?
Stock to lightly modified such as:
Performance air filter
Catback exhaust
What modifications do I need for a turbocharged car? Stage 2
Front mount intercooler
Cold air intake
Cat back exhaust system
Transverse engine layouts like pictured may require uprated gearbox mount / dogbone
For stage 2+ you will need the above modifications and the following:
Downpipe
Sports cat