Chowrasia shot 72 and was still at three-under for 36 holes in tied 44th place, while Shiv Kapur (69) was at two-under 142 and in tied 57th place.
Jeev Milkha Singh's wretched run continued as he carded an error-filled 78 and crashed out at five-over 149. Jeev stumbled to seven bogeys and just one birdie.
Bhullar outplayed Europe's upcoming star and World No. 66 Thorbjorn Olesen 4 & 3 while Lahiri won his second point of the event, edging aside World No. 23 Victor Dubuisson.
Lahiri, who has three Asian Tour titles, said, "You're playing for your country and you're playing for Asia. These are the two biggest things you can do as a professional golfer."
Lahiri and Bhullar have played a lot of team competitions together, right from Eisenhower Cup, Nomura Cup and the Asian Games and only last year they played the World Cup together.
Bhullar started birdie-birdie and then dropped a bogey on third. He closed the front nine with a birdie and turned in one-under.
Bhullar finished with rounds of 71, 67, 71 and 74 to be four-under 283. Bhullar played his second round at the par-71 West course and the other three rounds at par-72 East Course.
Bhullar, who shot 71 on the East Course, found his rhythm on the West Course as he birdied second, sixth and then three times in a row from ninth to 11th.
Kapur was the only Indian to fall inside the cut line as Jeev Milkha Singh (75-69) and Gaganjeet Bhullar (77-74) exited early from the tournament.
Bhullar had seven birdies and a bogey and was two shots behind leader Czech-born German Alex Cejka, who cracked a flawless eight-under 64 to lead by two.
Bhullar's earnings have gone up to USD 462,378 this season after he clinched his first title of the year yesterday.
The 25-year-old stayed focused despite a lengthy delay caused by the threat of lightning as he posted a closing three-under-par 68 for a 16-under total of 268.
Randhawa, who shot 67 in first round to be tied third is tied fifth at four-under for 26 holes, despite running into a double bogey early on the third hole.
Chiragh lived up to the adage 'beware the sick golfer' when he battled flu to card a round of 68 that was highlighted by an eagle-three on the 18th hole.
The 25-year-old Bhullar has enjoyed a solid season so far where he was awarded with the prestigious Arjuna Award last month.
Only three Indian golfers have won an European Tour title –- this is a jointly sanctioned event between European and Asian Tours –- and Bhullar will bid to join that league.
The big international name in the field is Oliver Wilson, the Englishman who finished second nine times on the European Tour and reached the pinnacle when he represented Europe at the 2008 Ryder Cup.
Overnight leader Aiken fired three birdies on the first nine and two more on his way back to maintain a three-shot lead over the chasing pack.