I think every car will respond differently to this. Some will show a lot of gain and others negligible..but generally it will improve top end power.
Late model cars which are designed for LEV and ULEV emissions have a catalyst that is stuck into the manifold that prevents any kind of header installation. Thats another problem.
Another thing to worry about is what is the ECU going to do when it detects a missing cat. Might need a remap for that.
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