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exhaust gas takes up more volume the hotter it is.
Therefore EGT has a direct influence on the gate behavior. It is likely you are seeing a wide range of results due to a wide range of EGT and post turbine exhaust system configs
to fix this issue and keep the internal gate may be as simple as reducing the EGT via tuning or water injection,
plus a superior flowing downpipe and exhaust (cutout system or larger diameter tubes)
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