You don't need it but I did this an maybe it was just me but I noticed the 1.0 ecu seemed to hold back slightly on full acceleration it's easy to swap it's behind the ashtray
I was thinking of poly bush kit for mine but it seems a lot of effort and with all the other bits I've to do I can't spend a day on it but I was trying to remove them off one that's to be scraped and was a bit shocked how hard it was