IN a bout of shareholder activism not often seen in India, institutional investors have written a second letter to Maruti Suzuki India (MSIL) questioning the opacity of the decision to house the new manufacturing unit in a 100% subsidiary of Suzuki Motor Corporation (SMC). In a strongly-worded missive, a clutch of 16 investors on Tuesday asked the Maruti management to quash this ?oppressive transaction? to save the company from becoming a ?shell? entity. While the first letter was signed by seven institutional firms, the second one has the assent of the remaining nine.