Clicking noise in cold start and during immediate take off in BARINA MY10

Just had this issue months ago to my Barina MY10(auto), not sure the cause of this clicking noise / ringing noise from right engine but after 10 mins warmed up and temperature goes up, the noise went off but sometimes I still have this noise during an instant take off. Forum says that the issue might be with the piston. I'm thinking that my car needs to be tuned-up. Service has already been done (15Ks) to this car but the noise still there. I'm bit worried that my dealer may not cover the warranty due to muffler alteration.

i dont know your areas laws but the muffler dos not affect engine issues.. header, maybe, some other things, yes, but just a muffler, no.

A clicking noise in how cold of temperatures? and your 100% sure its the engine, and not just the engine compartment? also, right side of engine when looking in it, or in relation to the car. which engine does your barina have?