Quote Originally Posted by 2000GTP View Post
only point of having a smaller pulley is to keep your boost up after doing free flowing mods that make the engine flow better. thats the way it makes power otherwise you wind up getting serious knock and you wind up boost stacking.
there is no such thing as "boost stacking". that is a stupid term to refer to making too much boost because of too much flow restriction. the m90 is ALWAYS "boost stacking" otherwise it wouldn't make boost.