No prime Shoab in test matches was mainly 142kph-148kph, and when he was was in good rhythm or on the hunt for a wicket or bowling to a tail ender he would crank it up to 155kph..
I only rate a bowlers speed in Test matches. 
Of the current bunch in Tests I rate the fastest Andre Norte ( sorry spelling)(Anrich Nortje - corrected by Mods), Starc, Wood, Archa (Archer), and Gabriel are the only Test match bowlers who can bowl 150kph+ in a test, with Norte (Nortje) the fastest, check out some of his ave speeds, most 90mph+ ave per innings. I rate him the fastest Test bowler since SHoab Aktar (Shoaib Akhtar) and Bret (Brett) Lee .