I also have stage 4 and there is no turbo sound difference that I can hear.
I'd say the difference in power is comparable to driving your car on a crisp cool day. It feels like it is breathing better. At this point I probably have enough power to keep me happy. When stage 5 comes out, I might do it just cause... Why not...
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2017 Mclaren 570s
2015 Porsche 911 GTS Manual - Gone
2012 550i M Sport Jet Black - modded - Gone
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