|
Too big pipe is not creating a vacuum so engine has to push the gases out to that "huge" space. That starts to create back pressure and it start to limit your power. Yes it first pushes the gases already through the turbo.
Same as in VAG TDI engines there is no benefits to putting aftermarket free flow air filters, unless you want to brake your turbo and engine.
Stock air filters and housing are being used up to even 400hp 1.9tdi cars.
Now if you pushing out close to 300hp migth be needed to put bigger pipe, but are you then worried also about efficiency or the max hp is the question.
|