Perrin Rear Engine Mount Inserts for 17-21 Civic Si

Perrin Rear Engine Mount Inserts for 17-21 Civic Si

Perrin Rear Motor Mount Insert is a two piece insert set that drops into the factory rear motor mount bushing on 10th gen Honda Civic Si 1.5T . On these cars, the rear mount mainly controls fore and aft drivetrain rotation when you get on and off throttle and when you bang a shift. Honda uses a voided rubber bushing, which is fine for comfort, but it also lets the drivetrain rock more than most enthusiasts want.

This Perrin rear engine mount insert fills those empty voids in the stock bushing. More fill means less deflection, so your L15 stops feeling like it is made of marshmallows when you launch, lift, or shift. Perrin includes grease, use it. It makes the mount inserts easier to slide in and helps keep squeaks away. Trade off time, you should expect more NVH. You will feel more vibration at idle and you may hear more drivetrain noise in the cabin.

People pick this insert kit when they want to keep the factory mount assembly and hardware, but tighten up the rear bushing behavior. It is also the right move if you want an insert based change instead of replacing the full mount. We run inserts like this on our own cars because they clean up sloppy shifts and wheel hop without turning the car into a vibrating mess.

Details

• Manufacturer part number: PHP DRV 100
• Vehicle fitment: 10th Gen Civic Si 1.5T
• In the box: one pair of inserts, one packet of grease
• Consideration: increased vibration is expected after installation

For the Install

Installation is pretty straightforward. You will pull the underbody shielding for access, remove the rear mount from the chassis, grease the inserts, then press one into each side of the bushing and reinstall. Perrin calls out torque specs, tighten the engine side mount bolt to 65 foot pounds and the chassis side mount bolt to 55 foot pounds. If you want a tighter, more connected feel out of your drivetrain area without swapping the whole mount, this Perrin motor mount insert kit does exactly that.