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Discussion Starter · #1 ·
Hello everyone.

I'm new here, I live in Brazil and I'm very happy to find so much info about 8th gen but there are some things that I'm not able to understand, that's why I have created this topic.

Recently I started some modification at my engine.
I have a civic si 2007 sedan.

HEADER + EXHAUST (Vibrant 2.5")
TB Spacer

What else I can do that would increase HP and/or torque?
I don't want to use turbo or supercharger.
A list of items, a estimation of HP torque gain and price would be good.

I realy appreciate your help. :vtec:
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