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you dont need the front mount if you have good mounts like hasport. imo place racing blows. they used to be good, but their reputation has gone down hill. the products just arent great quality. and i dont know about the weight of the jimfab bar. i know the main bar is chromoly, but i dont know how heavy that is. and why would you want to keep the stock radius rods when you can get beefier ones from jimfab or z10. and imo jimfab has the superior design for its function.
Back in the day, engines were just bolted to the frame rails of the cars making for very little inter-chassis movement(engine moving inside the car). This was ok, becuase with a V8, the power hits every 45 degrees alone the axis so the vibration is distributed pretty evenly over a circle.
However in I4 configurations, the power hits every 90 degress of the crank turn and it's momentum sometimes is transferred forward or backward depending upon where in the cycle, each cylinder is. This is why they came up with rubber engine mounts, that look something like this:
This flexibility makes it so that the harsh vibrations that 4cyl engines create don't transfer into the frame rails, and in turn into the cabin, making for a very quiet ride.
Above you see what we in the 4 banger world would call a "front" mount, when in actuality it's a side mount. (front of the engine is the accessories side. Think V8). This front mount is also called a Torque mount, and aside from the primary function of holding that part of the engine up, it's secondary purpose is to allow the engine to move when you nail the throttle. This actually eats up torque and keeps it from getting to the wheels prohibiting burnouts or breaking the tires loose as easily. This is done in regulary consumer vehicles for stability, and quietness.
Here you see the rear mount(another side mount in actuallity).
You can see the extra space put into the mount, but not nearly as much as the front mount, this mount is designed to absorb the jolts of shifting the manual transmission. The mount for the AT Accord and most AT cars are different for each respective vehicle.
These two mounts are crucial in the control of interchassis movement. To make a car ride easier and quieter, soften these up. For racecar applications where you need the most torque and horsepower to reach the wheels, you make them solid. Making them solid is a big choice because once you've done this there's no going back without a lot of work.
