Unless you're going to upgrade your cylinder heads and cam, you're not going to get much gain at all by installing an intake by itself. You'd be much better served by spending the money on gears or exhaust. 3.73 or 4.10 gears will be the best bang for the buck in increasing your performance, but will cost more than an intake. Exhaust will give you about the same increase as a manifold, will make your car sound better and won't have to be removed to install the heads and cam you'll want to do later.
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1993 5.0 LX 'Vert
GT-40X303 heads, E-cam, 1.6 roller rockers,
Cobra intake, Edelbrock 65mm t/b, 73 mm C&L, CAI,
24 lb injectors, AFPR, 3.73's, March underdrives.
FRPP headers, Bassani catted X, SLP Loudmouth.
Pony R's with Eagle ZR's.
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