Prothane 4-1901-BL Motor Mount Insert Kit Firm Black - All 3 Mounts

The Prothane 4-1901-BL is a firm-density urethane motor mount insert kit covering all three mount positions — front, passenger side, and transmission mount. Designed specifically for FWD performance applications, these inserts press directly into your existing OEM motor mounts to fill the factory voids and significantly reduce unwanted engine movement.

Stock rubber motor mounts are engineered with built-in voids to absorb noise and vibration, but this compliance comes at the cost of performance. By filling those voids with specially formulated polyurethane, the Prothane inserts restore rigidity to the drivetrain, improving power transfer, reducing wheel hop, and delivering more consistent acceleration and shifting feel.

Key Features:

• Firm-density urethane construction — race-oriented formulation for maximum drivetrain response
• Complete 3-mount kit — includes inserts for the front mount, passenger side mount, and transmission mount
• Installs into existing OEM motor mounts — no need to replace the entire mount assembly
• Reduces engine movement to improve hard-launch traction and shift consistency
• Limits motor travel to help prevent component breakage under hard acceleration
• Black urethane finish (BL suffix)
• Application-specific engineering for precise fitment

Note: These inserts are intended for use with motor mounts that are in good structural condition. If existing rubber is torn or severely deteriorated, the OEM motor mounts should be replaced prior to installing these inserts. For drivers sensitive to increased noise, vibration, and harshness (NVH), a street-density kit (4-1902-BL) is also available.