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In the rear trunk/boot fuse box (not the one in the main cabin) take out FUSE 22 and that's all you have to do and your car is uncorked. This leaves the bypass valves in the exhaust system permanently open, or something like that, instead of only above 4000 RPM.
The only downside to uncorking the exhaust is that you lose ~10 lb/ft of torque below 4,000 rpm (on the V8).
But dont take my words that i have copied and pasted.