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Need Advice - 4G93 engine - Port polish or Balancing or Cams

Hi all,

I own a 2002 year Wira with a 4G93P engine and I've just recently converted the Siemens ECU to a Satria Gti ECU #2468. So far I've done the entire exhaust system; mivec extractor, custom downpipe, 2" piping and muffler. Not forgetting the drop in K&N air filter.

I'm planning to squeeze more power out from the engine's potential and this leads me to my questions.

Which of the following brings out more power...
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