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Yes, your new longer intake tract should help low end torque. Take a test drive with the short stacks and note how the engine seems to have a strong "cam effect" increase in torque around 5000 RPM. Now install the longer stacks and the "cam effect" with drop 500 or more RPM. My stock 3.0 with carbs had the torque step at 5500 RPM with short intake manifolds, 5000 RPM with tall intake manifolds and 4500 RPM with 1.5 inch spacers and tall manifolds. Just had to cut the intake grill like you did.
-Andy
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72 Carrera RS replica, Spec 911 racer
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