4g91 ecu

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Hei guys hope u guys can help me out here, i m using a 4g92 auto. Currently my exhaust piping size is 1.6" and 2 centre bullet with a S-flow muffler. Feel like no power when goin up hill...Some told me was the piping size should be 2inches instead of my current 1.6inches.
And some say its not related to the piping size instead is the centre bullet... :frown: i'm kinda confused now...
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