yes underdrives are a very good gain for the money, the air silencer is inside the passenger side fender behind the air cleaner, it is supposed to quiet the incoming air but i didnt notice any difference when i took mine out, just take off the air cleaner assembly and there should be about 3 screws hodling it in there, remove those and pull the silencer out through the bottom, you will also want to advance your timing to about 14 degrees or so, the exhaust system is also very restrictive in these things, get an offroad h-pipe (little over $100) and you'll feel a noticable gain, then do the rest of the exhaust as money permits,
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88 Notchback 5.0, 3.73's, Explorer intake, pulleys, Crane 1.7's, BBK headers, off-road H-pipe, flowmasters, subframe connectors, 65mm TB, shift kit, March ram air kit, motorsport wires, MSD coil, upper and lower control arms, 155lph fuel pump, cheap 2800 stall, Crane Adj.FPR, best time- 13.99@99.75, not yet tested times after rocker and intake install
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