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10-29-2004, 06:27 AM

I would say both, especially since RSM sells them together.
http://www.rsmracing.com/portedintake.jpg, pic of manifolds together
http://rsmracing.com/us/main.htm, main page for RSM, go to Oldsmobil, then Alero, then 3400. I would say get both ported because, as everyone says, you only get as much airflow as the smallest hole in the engine will allow. No point in porting the upper intake manifold if you don't port the lower intake manifold.

10-29-2004, 06:27 AM	#6
flalero Posts: n/a	I would say both, especially since RSM sells them together. http://www.rsmracing.com/portedintake.jpg, pic of manifolds together http://rsmracing.com/us/main.htm, main page for RSM, go to Oldsmobil, then Alero, then 3400. I would say get both ported because, as everyone says, you only get as much airflow as the smallest hole in the engine will allow. No point in porting the upper intake manifold if you don't port the lower intake manifold.