Okay the hell is still leaking?!?!

Car is a 20 years old Hyundai Getz. Had it’s MOT and major service done last week.

A month ago I checked the exhaust system as the interior smelled of burnt petrol/exhaust fumes when cold starting and left running for five mins fir the rpm to drop.

I had a massive leak on the flex joint. Changed the whole downpipe. I have relatively new backpipes (changed a year ago), mufflers, now downpipes, headers.

Was thinking that probably the major service will tell me something smart.

Nothing.

I have no clue what else it could be.

Any guesses where else it could come from after a full exhaust replacement in the course of a year?