Similar question regarding retune (Betty STI):

Catback installed, retune?
If no, how about catback + headers?

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Current:
MY10 STI hatch - White

Previous:
2012 Evo X - White
Parts: HKS | SSP | GARRETT | TURBOSMART | ARC | COLTSPEED | BLITZ | CAMTECH | VARIS | VOLK | CUSCO | TIEN | FORGE | FULL RACE