[Zef]

Originally Posted by MJ80.

Could it be belt or tensioner/related to any pully possibly?

i remove belt, and sound persist. Chain tensioner - does not look like.

[MJ80.]

Oil analysis? See if signs of somthing wrong internally ? Its cheap.

[guop]

sounded exctly how much car sounded when i had just installed my downpipes, they were loose so I had a leak in the exhaust which caused that "helicopter" sound

[Zef]

Originally Posted by guop

sounded exctly how much car sounded when i had just installed my downpipes, they were loose so I had a leak in the exhaust which caused that "helicopter" sound

where exactly was the leak?

[guop]

Originally Posted by Zef

where exactly was the leak?

Connection from downpipe to rear exhaust

[Zef]

any updates?

[Zef]

by the way, i flash car with MHD stage1. Car rides, perfectly, no check, but this sound make me mad.