Lahiri's two-day total stands at nine-under-135.
Lucknow's Sanjay Kumar fired a five-under-67 to be placed second at eight-under-136, at the Eagleton Golf Resort here.
Lahiri (73-62) was off to a flying start in Round Two as he had a 30-feet eagle putt on the opening 10th where he managed to extract a birdie. The 26-year-old went on to convert 15-footers for birdies on the 11th and 12th.
Anirban's chip for eagle missed the hole by a whisker on the 15th where he picked up his fourth birdie of the day.
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The three-time Asian Tour winner recovered well from the bunker to salvage a birdie on the seventh before landing his chip within inches of the pin for his last birdie on the ninth. He thus signed off with a near-perfect bogey-free round.
Incidentally, Lahiri also holds the record for the joint lowest-to-par score in a single round ever recorded in India, thanks to his round of 12-under-60 posted a couple of years back in Greater Noida.