Lahiri, the top ranked Indian in the world and winner of four titles on Asian Tour, carded a brilliant seven-under-par 64 while Chowrasia shot five-under 66 to be at joint second position with Chinese Taipei's Chan Yih-shin here at the Seri Selangor Golf Club course.
Another Chinese Taipei player, Hung Chien-yao carded a 67 for fourth place.
Among other Indians, Chiragh Kumar (70) was tied 21st, Jyoti Randhawa (71) was 37th, Digvijay Singh (72) was tied 54th, Rahil Gangjee, Manav Jaini and Rashid Khan shot 73 each to be tied 69th, Arjun Atwal and Daniel Chopra went to 74 in tied 92th place. Sujjan Singh (76) and Himmat Rai (78) struggled to 117th and 125 places, respectively.
An in-form Lahiri, who finished tied fourth in Taipei last weekend and was runner-up here last season, was delighted with his blistering start.
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"I'm really happy with how I played. I got off to a good start and made a couple of good putts. It could have been even better. I missed some short putts but I hit it really good," said Lahiri, who is a four-time Tour winner.
"On this golf course, you are never in total control. You can hit a good shot but have a bad bounce. Sometimes you don't make the best swing and you get a decent score. You need a lot of help from the golf course but as far as what I've been doing, I'm feeling mentally calm because I know I can hit it well enough to play well," he added.