I believe the 87's had a silencer between the filter and engine. It literally looks like an exhaust muffler but plastic, and it has "Ford" molded on the top. I replaced mine with a conical air filter setup, eliminating the filter box and silencer. (Mine is a '90.) I did this after I installed a dynomax dual exhaust from a v8 mustang with a custom Y-pipe. I have noticed that the engine does seem to rev a little free-er and it pulls further in the rpm range, although I had done these mods primarily for aesthetics and sound. My car is still pretty slow, so I concentrate on making it handle good, since it does have the advantage of not having a heavy V8 in the nose. I told myself I would replace the engine with something more substantial when it dies, but it is refusing to do so. It has 142,000 miles on it, but if I rev it to 3,000 and dump the clutch it still will smoke the tires!... well ok, tire.
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