The PowerAid spacer incorporates a helix bore that spins the incoming air charge. The increased combustion efficiency provides torque and mileage increases. Installs easily in under 30 minutes. Detailed instructions are included. Fits Jeep YJ & Jeep XJ Cherokee, 1991, 1992, 1993, 1994, `1995, 1996, 1997, 1998, 1999, 4. 0L Engine. |