27WON Rear Motor Mount (RMM) | 16-21 Civic

Awesome improvement over stock, went in flawlessly

Street (70a) RMM on 2017 Civic Si

This mount is a perfect combination with summer tires (Continental Extreme Contact Sport 02s in my case) for keeping everything rolling along at any speed you desire. The intense vibration from the initial installation dies down after ~500 km. However, there is some unpleasant NVM when around 1.3 RPM to 1.7 RPM. So long as you aren't in stop-and-go traffic constantly it's a mild inconvenience for the improved handling and this is just with the Street version of the mount.

Very good RMM

The 27WON RMM is excellent. I took the 90A which is the outright metal to metal. I can see less power loss output around my tires and chassis. However, There is a lot of NVH at the beginning (around 1-2 weeks) but once the mod is settle in and you get used to the noise, it is significantly less loud. Nonetheless, it will force you to drive better because you want to avoid the loud noise coming from your engine. If you drive properly, you should not notice the NVH much. 27WON should maybe make the other 2 engine mounts so you can change the whole engine mount kit.