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hey guys,

so my tn/tp throttle body is 50mm, i want a bigger one but
does anybody know how big i can go before i start losing throttle response?

70/75mm feels about right to me?

I was thinking the same and went out and got a 70mm TB from a XF falcon. After speaking with an engine builder he seemed to think a 60mm would be fine for the 4G63 so maybe a 70mm will be okay for a 2.6