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Really...
I know of two middle aged women who both own 'performance' cars who never drive them to there full potentially, and have no interest in cars in general. The main reason for owned them is so they look good when parked on the drive, tennis club and gym ( keeping up with the joneses)...
It's no essential mate. I did Castle Combe with a decatted k-tec stealth and maxogen without a remap and it was fine.
The RS tuner performance map with your mods will make the car pull much better from low revs, and the raised rev limiter is handy for track work.