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The 5.7 car intake has the most torque (08- and prior). The 6.1 intake gives up ~ 5 ftlb to the 5.7 intake down low, but passes it around 5200 and has good power through 6400 or so. The drag pack intake loves RPM and is the best of the carb style intakes, with better high end hp than the two efi intakes. I've heard significantly more than the 6.1 above 7000 on up to 8200. It does however give up significant torque down low to the 6.1 and 5.7.
The LX guys typically do not rev past 6400 with their tuned stock computers, so I'm anxious to see what my ported 6.1 intake will do above 6400.
A great budget option is a 5.7 eagle intake, if you've got a 5.7 early head with big enough ports (or the intake spacers) or a 6.1 head.
An old style 5.7 intake will not be a limiting factor on most of the hemi swaps in an old car. I've had it go 11.50 @ 117 with a 5.7 392 swap back in 08 @4150 raceweight.
It won't look pretty, but it will work.
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