Durban - Craig Alexander, Keshav Maharaj and Daryn Dupavillon starred with bat and ball as the Dolphins took complete control on day two of their Sunfoil Series clash against the Cape Cobras at Sahara Stadium Kingsmead on Friday.
All three made vital runs for a wagging tail, before taking important wickets as the visitors reached the halfway stage of the game on 157 for five.
That was in reply to the home side's 405 all out, which only came after some strong lower-order fight.
Maharaj scored an attacking half-century of 56 from just 63 balls, while fast bowlers Dupavillon (44 off 58) and Alexander (39 off 57) also chipped in as 121 runs were added for the final three wickets.
Alexander then picked up two for 30, Maharaj two for 50 and Dupavillon one for 35 as an inexperienced Cape side battled in reply.
Their inexperienced top order was put under pressure from the start when Matthew Kleinveldt was dismissed for four.
Simon Khomari (34) did manage his highest score of the season, but they were then made to rely on Omphile Ramela.
The captain was battling it out with an unbeaten 72 from 169 balls, although the Dolphins were well in command with a 248-run advantage by the close.