SCOBY

I've had my full system on my terzo for about 5 wks now, just been out for a tear up and noticed the normal burble has turned into a roar.

You know u can always tell a subaru coming up past you by the burble note, this seems to of turned into normal sounding performance motor, just pure BLAGHHHHHHHHHHHHHHHHHHHHHH. Not BURBLEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE.

Is it me, I dont think so.

Can someone explain.

SCOBY