Hi guys,
One of my friends just changed his muffler to a free flowing one recently and after the upgrade, his boost has been creeping like mad. From 1.4 bar preset on AVCR jump up to 1.8 bar of actual boost.
Should he retune his ECU and AVCR, or just tuning his AVCR will do ? His ECU is a stand alone one and he already fine tuned it on dyno before he changed his muffler.
ANy help is greatly appreciated.
Thanks !
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