Well I just placed an order. Well see how this does on the my S13 when it gets here.
I currently have all poly bushings, solid subframe mounts, welded diff, SR, 3" straight exhaust to a Mag. Muffler a FMIC with no BOV and mechanical fan.
Unlike my Tacoma, there is no confusion if the engine is running!
Another product out there is Fatmat, I may try some of there's as well, although ion not sure how to do a comparison without striping out and changing over the products.
http://www.fatmat.com/bulk/fatmat/25.html