Hi Deezee, don't know is the short answer :-)
The flexible pipe is the one off the Sierra, the rigid pipe is a bit of drain pipe, I think it is 2 1/2 inches diameter, I will measure it when I get back later today. It is larger in diameter than the point at which the throttle body connects to the inlet, I figured if I kept everything bigger than the original Sierra I should not have a problem with it being restrictive. Hope that makes sense??
Enoch
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