Got my timing chain changed as my car completed 63500 kms. According to the TASS more than the chain the pads (plastic) wear out thus causing the play in the chain.Although the TASS guy said that the chain can still go on but I got it changed as u dont know extended warranty can be denied for a simple small reason .I saw a Linea petrol getting the engine Head changed at 80000 kms at a whooping cost of RS. 40000 .The extended warranty was denied to him as he didn't get the chain changed according to schedule.I dont know why the guy didn't fight as Fiat confirmed the change schedule to the dealers in June 2012. Now the engine idle better but I dont find much difference in the engine noise (as VIJAY put his engine noise reduced by 50%) and also no difference in the FE.I think timing chain issues wiould have its effects in lower gears and less in higher gears unless and until its complete worn out or pads are gone.After the change the lag has reduced in lower gears but still have to test for results (+ or -)also got the EGR cleant as it was full of carbon and sludge.They have to open the EGR to clean it completely.May be the EGR change helped the lag go away. Total cost Rs. 9600 with including coolant change(rs. 1600), EGr cleaning (Rs.1200 only labour) and rest chain change parts and labour for the chain change labour (Rs. 1800). will update the results in a weeks time.