You overlooked a simple air-filled rubber sack behind the gas pedal... You can already buy them, and there is no complicated (or even not-complicated) installation. You blow it up and put it behind the pedal. If you want more feedback, blow it up harder.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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