This is a great place to ask:
Does anyone know what the best uppipe would be to mate with a GruppeS UL header. I have not put the header on yet and now after reading this I think I should upgrade the uppipe as well. I would like to avoid the "flow killing step up/down". Does anyone have any aftermarket uppipes off their car I could take a look at? I do plan on staying with a stock mounted turbo. Curious about the Cobb Inconel, are they worth the price? Grimmspeed..? I think Perrin has a specific pipe size to minimize loss of velocity...
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Stuff sold by the gram is always more exciting than stuff sold by the pound. JC
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