Sorry if it's old news (4yrs old) but this is the first of a great series of videos on the M3, starting with the E30, from Henry Catchpole - a bona fide motoring journalist and a refreshing change from a lot of the numbskulls on YT.
https://youtu.be/gAcSYTuzst0?feature=shared
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Owned: 440i GC LCI with MPPSK, F31 330D M Sport with MPPK, F11 530D SE, F11 520D SE, E61 530D M Sport, E36 325i plus many MB's, Audi's & Volvo's