Tenneco Clean Air India’s Rs 3,600-crore IPO has entered its final bidding day with strong demand, recording 2.93x subscription by Day 2 after receiving 19.52 crore bids for 6.66 crore shares. The issue is also attracting solid grey market interest, with a GMP of Rs 76, about 19%, indicating a potential listing price near Rs 473 versus the issue price of Rs 397.