5.0 Mustang & Super FordsHow To Engine
Replacement Air Filter for '86-'93 Mustangs
Gaining High Flow For 5.0s
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The stock air-filter box in 86 to 93 Mustang 5.0s is not exactly the prettiest thing in the world. Besides that, the panel air filter contained inside has to get its air from a small, oval-shaped hole on one side of the box.
This replacement induction system from Moroso eliminates the air-filter box and relocates a new K&N filter inside the front fenderaway from the hot air in the engine compartment. Moroso claims this system flows more air than the stock airbox and that the system adds about 11 hp to an otherwise stock 89 to 93 5.0 Mustang.
The Moroso kit is designed to work with a stock mass air meter, but we bolted the system on a more radical car that uses a Ford Motorsport 80mm mass air meter as found on 96 to 98 Mustang Cobras and Lincoln Mark VIIIs. Along with the bigger meter comes an aftermarket piggyback chip that alters the air/fuel and timing parameters of the stock EEC IV programming. This combo controls a 5.0-based, 347 stroker small-block. When we installed the Moroso duct on the car, idle quality was affected during cold starts, but it ran great while cruising. We suspect some additional chip tuning with the Moroso setup in place would fix the idle problems we encountered, and the system is certainly a slick upgrade for less-modified Mustangsespecially when you consider how easy it is to install.