You could use the Golf R style downpipe (originally developed that design for the S3 / A3 Quattro), but with the engine sitting lower in the Tiguan, we managed to get a one piece design into the Tiguan - mainly to reduce costs. performance is pretty similar on both.
There are internal differences for the wastegate sizes between the K03 & K04 versions of the downpipe. The wastegate separator (on the divorced wastegate style) has to hug the profile tight of you lose some of the benefit of splitting the different speed gasses.
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