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Catless headers and E85 have been shown to provide the most significant (double digit) gains.
A 4.67 diff will increase wheel torque by a further 15% to make a very quick NA car.
Compared to these, other bolt-ons offer insignificant gains. See dyno day charts from Shiv at Vishnu performance.
If you have no access to E85 and need to retain cats then I highly recommend a lower ratio diff for spirited daily hooning.
And, as others have alluded to, don't ruin your lovely car by modding the shit out of it unless you're chasing silverware.
Sent from my SM-G973F using Tapatalk
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