Had a little more time behind the wheel so wanted to update my impressions. Throttle response is immediate - there is no delay. I do not have a sprint booster but I think someone commented that one of the benefits was in taking off from the line. The motor mounts have a similar effect.

I mentioned previously that the engine gets a bit thrashy above 4000 rpm. Either I am getting used to it or I my initial impression was overblown. It is a bit rougher but not sure a passenger would really notice and I think it is a decent bit higher in the band than the initial 4k I reported.

I am happy with the poly motor mounts but am still debating whether to try 60# urethane vs. the 80#. I may go ahead and have my shop pour the 60# and swap for a comparison.

All of these impressions are based on ~20 miles total of driving so not a whole lot of seat time.

If you track your car at all I think this is a worthwhile mod. This is not a mod that would drive you crazy or really bother you in a daily driver. The bit of exhaust drone I have on the hwy is significantly more annoying than the motor mounts.

If you decide to pour your own mounts be very exact in your measurements of hardner to urethane. Even being off a small amount can ruin the batch.