Engine noisy

[Golfer]

Hi, I am seeking advise on noisy engine. I drives a end 2004 sunny and recently notice uncomfortable noise from the engine when starting from cold. Some people in this forum says change from fully syn to semi-syn, change air filter & check parts for defects.

 

Any advise from people who has encounter such problem? How does it sound like, you may ask. It sounds like a taxi starting up....

 

Thanks in advance