Added this one in when doing the new clutch and SPEC aluminum flywheel. Shifting has tightened up quite a bit, though in part that might be due to the stock mount having been rotted and torn-up.
I'm very picky about such things - I perceived no increase in cabin vibration.
Plenty of reviews here to give you the full picture on why this is another worthwhile upgrade. But I will say that the quality on this part is superb. I appreciate the conscientiousness of the GS team in making these parts. Clean welds, nice coating and finish on the screw mount, and good quality polyurethane for the isolation.
Top quality all around, great performance, and good value. Another highly-recommended upgrade.
Rating: [5 of 5 Stars!]