funny you should say that...
your a bit limited with a big bore race exhaust manifold on a RHD 2002, there is only one size, shape and length that will fit, bit i did play with the system and back pressure with various restricters, and found that different intake lengths had an effect on what the engine required in terms of the rest of te exhaust
when i arrived at the optimum inlet trumpet length after many hours on the rolling road, i meassured the total intake length from the back of the valve to the end of the trumpet,
it was exactly the same length as the exhaust primaries.
of coarse going turbo put a stop to all this intake tuning, shame, although i did wonder about ram pipes and induction tubes on the turbo, anyone remember Torque Rams for mini's on single su's?
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