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I was talking with alphadark the other day and he mentioned that on hard shifts, it sounds like the motor hitting the firewall. I was wondering if anybody else has that problem?
I know the motor isn't actually hitting the firewall, and that the factory rear motor mount is just maxing its range of motion out with the engine movement. But having heard that sound before, I know how unnerving it is. Fortunately, it looks like the RS shares some motor mount design with the ST and there is already a solution for it.
The cp-e motor mounts are available for the RS in both 55A and 70A durometer and will eliminate that extreme motor movement and help put more power to the ground.
The cp-e xFlex Stage 1 Rear Engine Mount keeps the engine from moving back and forth and is the most commonly replaced of the motor mounts as it makes the biggest and most noticeable performance difference.

The cp-e Motor Mounts all use EPDM which is a rubber material that can stand up to higher temperatures than Urethane and doesn't require as high of a durometer to hold itself together due to EPDM being a denser material. Because of this, the EPDM bushings do not transfer as much vibration into the cabin and allow you to keep your ride quality at a much higher level.

While the rear motor mount fights against the back and forth rocking motion, the side mounts handle gravity and side to side motion from cornering. They will help keep the motor planted in the high G corners that the Focus RS is very capable of achieving.

All together, the following options are available.
cp-e xFlex Rear Engine Mount Stage 1 55 Duro - $138.65
cp-e xFlex Rear Engine Mount Stage 1 75 Duro - $138.65
cp-e xFlex Drivers Side (trans) Mount 55 Duro - $279.10
cp-e xFlex Drivers Side (trans) Mount 70 Duro - $279.10
cp-e xFlex Passenger Side (timing cover) Mount 55 Duro - $296.84
cp-e xFlex Passenger Side (timing cover) Mount 70 Duro - $296.84
If you're having trouble deciding what duro to get, I suggest you look at the use for the car. If you plan on a lot of track time or AutoX, you may want to consider the stiffer mounts at the cost of a few more vibrations. If you just want to be able shift hard without the loud bang, but you don't get aggressive a lot, then the lower duro would be more suited for you.
I know the motor isn't actually hitting the firewall, and that the factory rear motor mount is just maxing its range of motion out with the engine movement. But having heard that sound before, I know how unnerving it is. Fortunately, it looks like the RS shares some motor mount design with the ST and there is already a solution for it.
The cp-e motor mounts are available for the RS in both 55A and 70A durometer and will eliminate that extreme motor movement and help put more power to the ground.
The cp-e xFlex Stage 1 Rear Engine Mount keeps the engine from moving back and forth and is the most commonly replaced of the motor mounts as it makes the biggest and most noticeable performance difference.
The cp-e Motor Mounts all use EPDM which is a rubber material that can stand up to higher temperatures than Urethane and doesn't require as high of a durometer to hold itself together due to EPDM being a denser material. Because of this, the EPDM bushings do not transfer as much vibration into the cabin and allow you to keep your ride quality at a much higher level.
While the rear motor mount fights against the back and forth rocking motion, the side mounts handle gravity and side to side motion from cornering. They will help keep the motor planted in the high G corners that the Focus RS is very capable of achieving.
All together, the following options are available.
cp-e xFlex Rear Engine Mount Stage 1 55 Duro - $138.65
cp-e xFlex Rear Engine Mount Stage 1 75 Duro - $138.65
cp-e xFlex Drivers Side (trans) Mount 55 Duro - $279.10
cp-e xFlex Drivers Side (trans) Mount 70 Duro - $279.10
cp-e xFlex Passenger Side (timing cover) Mount 55 Duro - $296.84
cp-e xFlex Passenger Side (timing cover) Mount 70 Duro - $296.84
If you're having trouble deciding what duro to get, I suggest you look at the use for the car. If you plan on a lot of track time or AutoX, you may want to consider the stiffer mounts at the cost of a few more vibrations. If you just want to be able shift hard without the loud bang, but you don't get aggressive a lot, then the lower duro would be more suited for you.