RS clio 172
Hi guys, i have been reading alot about this so called RS tuner and was thinking of geting one. I just really dont get how to use it, Where it goes (plugs in), What to do with it and if it makes a difference. Anyone got any advice? How bad can i mess this up if it all goes wrong? Is it likely i will mess it up? Sorry bout another RS Tuner thread but i really dont get it lol. Cheers.