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Originally Posted by toyota_guru
if your still using the stock manifold, then you have accomplished nothing worth writing about by going 3". A 2.5" down pipe is better suited for the stock manifold. Its the manifold that has the most restriction on the exhaust side, not the down pipe.
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the point of the 3 inch downpipe is to allow the waist gate air to mix more smoothly with the exhaust coming from the primary turbo outlet, it removes the massive restriction of the stock 90 elbow, And even if your right, its still worth writing about in my oppinion, that how we learn, have fun with your 2.5 inch dp. good day