Hasport FG4RR Rear Engine Mount for 12-15 Civic Si

Hasport FG4RR Rear Engine Mount for 2012–2015 Honda Civic Si

If your 2012–2015 Civic Si feels like the drivetrain is slopping around, lazy shift engagement, clunks, or wheel hop on hard launch, the factory rear mount is usually the culprit. The Hasport FG4RR rear engine mount tightens up the FG4 chassis by controlling engine movement, sharpening throttle response, and keeping everything where it belongs when you actually drive the car hard. Honda tuned the OEM rear mount for comfort first. After 10+ years, that rubber turns into a marshmallow. The engine and trans rock back and forth under acceleration, braking, and shifts, which leads to missed gears, extra shock on the other mounts, and that vague “mushy” feel. The Hasport Civic Si rear mount swaps the stock piece for a much more rigid unit with your choice of bushing stiffness, so you can match it to how you really use the car. Hasport has been a go-to name in Honda mounts for a long time, and this FG4RR is a direct bolt-in for the FG4 Civic Si subframe and factory bracket, no weird universal brackets, no hacking.

Key Benefits

• Locks down engine movement during acceleration and shifts so the drivetrain stays in line when you’re on it
• Cleaner, more consistent shift feel because the trans isn’t rotating away from the shifter cables
• Less wheel hop on launches compared to tired OEM rubber or generic replacement mounts
• More repeatable throttle response since the engine isn’t rocking back and forth every time you mat it
• Direct bolt-in replacement for the stock rear engine mount, no cutting, welding, or “universal fit” nonsense
• Built specifically for the FG4 Civic Si chassis, not a one-size-fits-nothing bracket

If you’re hunting for a Civic 2013 rear engine mount or Civic Si 2012 rear mount that actually fixes drivetrain slop, this is the one most people end up buying once they’re done experimenting.

Precision You Can Actually Feel

The Hasport FG4RR rear engine mount uses proper CAD/CAM development, so the geometry, alignment, and clearances actually make sense in an FG4 engine bay. On these cars, keeping the engine where Honda intended is a big deal, especially if you’re launching hard or running sticky tires. By cutting down engine rotation more than the factory piece, this Hasport Civic Si engine mount helps keep axle angles, exhaust clearance, and shifter linkage geometry much more consistent. In practice, the car feels tighter, more predictable, and more connected, instead of the engine trying to leave the bay every time you clutch-kick it. This isn’t a “close enough, drill a new hole” mount. Hasport builds the FG4RR specifically around the 2012–2015 Civic Si layout, which is why it behaves better than bargain mounts that claim to fit everything.

Urethane Durometer Options Explained

You get four urethane options on this Hasport rear mount for the 2012 Civic and up, all the way to the 2015 Si. Pick wrong and you’ll either hate the vibration or still hate the wheel hop, so it’s worth a minute to choose correctly.

• 62A Urethane (U62A – Street)
  Softest of the bunch. Ideal if you daily the car and want a vibration minimizing engine mount that still fixes the worst of the slop. NVH goes up slightly over dead stock, but it’s totally livable for a commuter that still hits a backroad now and then.
• 70A Urethane (U70A – Track/Spirited Street)
  The “I actually drive this thing hard” Civic performance rear mount. Noticeably stiffer than stock, much better control, but NVH is still reasonable. Good match for bolt-on FG4s, occasional track days, and people who don’t mind a bit more feedback.
• 88A Urethane (U88A – Race/Heavy Track)
  For aggressive street builds and regular track work. Engine movement is basically gone, shifts feel locked in, and launches are more repeatable. Expect clear vibration at idle and low RPM—this isn’t the bushing for someone hunting luxury-car vibes.
• 94A Urethane (U94A – Extreme)
  The stiffest Hasport bushing Civic Si 2012 option. Aim this at drag, time attack, or any car that spends most of its life on track or trailer. Maximum drivetrain control, maximum NVH. If you daily your FG4, don’t pretend you’ll love this one.

If your car is mainly street use, U62A or U70A is the smart call. If the car sees more grid than grocery runs, U88A or U94A will keep the driveline locked down the way you want.

Vehicle Compatibility

Direct fit for:

• 2012 Honda Civic Si
• 2013 Honda Civic Si
• 2014 Honda Civic Si
• 2015 Honda Civic Si

This Hasport FG4RR engine mount is only for the FG4 Si chassis. It won’t fit non-Si models.

Installation Notes

The Hasport rear mount 2012 Civic piece bolts into the stock rear mount location using the factory hardware points. No fabrication, no extra brackets. You’ll need basic hand tools and either a jack with stands or an engine support bar. If you’ve done suspension or basic drivetrain work before, this is a very manageable Saturday job. After install, the urethane will take a bit of time to settle in; light vibration at idle is normal, especially with U70A and up.

Build Quality and Longevity

Hasport mounts have a solid track record for long-term use. The FG4RR uses quality materials that handle heat, load cycles, and aggressive driving a lot better than the soft factory rubber. Urethane doesn’t sag and crack like the OEM rear bushing Civic Si piece, so performance stays more consistent over the life of the car. If your OEM rear engine mount Civic Si is already torn or leaking, this is both an upgrade and a long-term fix instead of just another rubber band.

Why Start with the Rear Mount

On the 9th gen Civic Si, the rear mount does most of the work controlling engine rotation. Swapping just this one Hasport mount Civic 2012+ part usually makes a bigger difference than people expect cleaner shifts, better launches, and a more direct feel, even with stock side mounts. For a lot of FG4 owners, this is the first drivetrain upgrade, and it’s usually the one they wish they’d done sooner, whether they’re running this Hasport FG4RR engine mount by itself or pairing it later with a Hybrid Racing mount Civic setup on the sides.

Confidence for Street or Track

Whether you’re refreshing a high-mile daily or dialing in a track-focused FG4, the Hasport FG4RR rear engine mount gives you real control over how your Civic behaves. Multiple durometers, proper Civic Si specific fitment, and a clear trade-off between comfort and stiffness, no guessing. If you want your 2012–2015 Civic Si to feel more planted, more responsive, and more honest about what the chassis is doing, this performance engine mount Civic upgrade is the place to start. We still run these exact mounts on our own cars.