Originally Posted by
Adam-M
They are slow spooling pigs for their turbo size and the reason why JDM imprezas have had equal length manifolds from about 2002 onwards.
From a lost of the posts on here about YB's etc.....they seem much worse !
And no OEM Subaru ever had equal length manifolds.
Some from around 2005 or so had twin scroll, but that is not the same thing.