Over the last few days i have been wondering if the header that i have will be suitable for my twin scroll GT40R setup. Each of the below headers are equal length headers which the merged joins of the runners will be separated into a true twin scroll header..

Im running an x-force equal length header to which ill be making a modified twin scroll upipe to suit and. However im unsure whether the diameter of the pipes may be a restriction to flow...

Ive been looking at the perrin equal length headers as there is some data suggesting that they flow very well but i think they are the same diameter as the x-force headers.

The full race equal length headers would be optimal as they are of much greater diameter it appears from the pictures.

What are ur opinions on diamter of the runner pipes for the headers, in terms of flow and outright power??

will the larger diamter pipes be less responsive??

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